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09-17-2020, 03:29 PM
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#1
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Senior Member
Join Date: Jan 2019
Location: Danville
Posts: 172
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I went to the Cat scales today.
2020 Ram 3500 DRW Laramie 4x4 LB weighs 8660 with me and a tank of fuel, no hitch, no passengers, no tools, just the truck as it was delivered to me. I will post the weigh tickets showing the stats. The hitched up ticket has the 5th wheel loaded but no liquids except 15 gallon of GAS for the generator, no perishable food, no motorcycle, but pretty much everything else that I camp with is in there, including clothes.
Truck:
GVWR is 14000 lbs.
GAWR Rear is 9750 lbs.
GAWR Front is 6000 lbs.
As shown in another thread my Payload sticker says NTE 5621lbs cargo and passengers.
Here is where I need the help of others, experts of the forum. Seeing these numbers, what is my pin weight?
This truck was built in August 2020.
Placard on door shows front tires at 80psi and rear at 65psi, am I wrong in thinking that is reversed? My last 2 Rams had the fronts at 65 and the rear at 80 (Single rear wheel axle) I ran 80 PSI most all the time all 4 tires w/o any issues.
Thanks in advance for the help!
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John
2020 Keystone Fuzion 369
2020 Ram 3500 CTD DRW 4x4
2018 Honda Goldwing DCT Tour
Andersen Ultimate hitch
Youtube channel - Wingin' it with John
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09-17-2020, 03:33 PM
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#2
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Senior Member
Join Date: Nov 2017
Location: Mico, TX
Posts: 7,462
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Would think the dually double rear tires might be taking up weight more than a single so 65 PSI sounds like about right; LRE on the front at 80 PSI. That is just conjecture and I will leave the numbers to those who don't use their fingers and toes to cypher numbers.
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wiredgeorge Mico TX
2006 F350 CC 4WD 6.0L
2002 Keystone Cougar 278
2006 GL1800 Roadsmith Trike
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09-17-2020, 05:07 PM
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#3
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Senior Member
Join Date: Jul 2013
Location: Liberty, Texas
Posts: 5,034
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80 front and 65 back per my door sticker. That is what I run when loaded. If I'm not loaded up I drop the rears down to 44, maybe 42.
FYI...I tried all kinds of alternatives to the OEM plastic valve extenders for the inside duals. Nothing worked. I went back to the plastics. Got a couple from the dealer to keep in the console. What does work is a tire inflation air "gun" with a straight tip, not angled.
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2018 Ram 3500 Laramie CC DRW LWB 4X4 Cummins Aisin 3.73
Reese Goosebox 20K
2018 Heartland Landmark 365 Oshkosh
2008 Bigfoot 25C9.4 LB Cabover
2023 CanAm Defender SXS
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09-17-2020, 05:36 PM
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#4
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Senior Member
Join Date: Jul 2017
Location: Chaska MN
Posts: 227
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Experts please correct these calculations.
pin = (steer2 + drive2) - total1 = (5020 + 7200) - 8660 = 3560
trailer = trailer2 + pin = 12360 + 3560 = 15920
[EDIT]
You can also do it this way …
trailer = total2 - total1 = 24580 - 8660 = 15920
pin = trailer - trailer2 = 15920 - 12360 = 3560
Same math depending on how you look at it. By the way, your mostly unloaded pin weight is the same as my trailer's dry weight. I could load my entire trailer on the back of your truck and it wouldn't even breathe hard. :-)
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Randi & Shirley
2016 Ford F-350 SRW CCSB 6.7L 4WD
2022 Forest River Vibe 26RK
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09-17-2020, 05:56 PM
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#5
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Senior Member
Join Date: Jan 2019
Location: Danville
Posts: 172
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Thank you Randi. I knew there was a formula but could convince myself what I remembered was right. I used a slightly different method but got the same result.
Thanks you.
__________________
John
2020 Keystone Fuzion 369
2020 Ram 3500 CTD DRW 4x4
2018 Honda Goldwing DCT Tour
Andersen Ultimate hitch
Youtube channel - Wingin' it with John
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09-17-2020, 05:58 PM
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#6
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Senior Member
Join Date: Jan 2019
Location: Danville
Posts: 172
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By the way, your mostly unloaded pin weight is the same as my trailer's dry weight. I could load my entire trailer on the back of your truck and it wouldn't even breathe hard. :-)[/QUOTE]
__________________
John
2020 Keystone Fuzion 369
2020 Ram 3500 CTD DRW 4x4
2018 Honda Goldwing DCT Tour
Andersen Ultimate hitch
Youtube channel - Wingin' it with John
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09-18-2020, 06:53 AM
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#7
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Senior Member
Join Date: Apr 2012
Location: Portland, OR
Posts: 4,222
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Quote:
Originally Posted by gearhead
80 front and 65 back per my door sticker. That is what I run when loaded. If I'm not loaded up I drop the rears down to 44, maybe 42.
FYI...I tried all kinds of alternatives to the OEM plastic valve extenders for the inside duals. Nothing worked. I went back to the plastics. Got a couple from the dealer to keep in the console. What does work is a tire inflation air "gun" with a straight tip, not angled.
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X2 to the inflation
You only need 65 psi in the rears as you have 4 tires, with a 9,750# rating if you took them to 80 psi then they would support nearly 12,000#, and ride like rocks. Just because a tire say 80 psi max on the sidewall you don't need to inflate to that for them to work for the load.
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Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360
Visit and enjoy Oregon State Parks
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09-18-2020, 07:40 AM
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#8
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Senior Member
Join Date: Aug 2012
Location: Waco, Tx
Posts: 5,457
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My F350 with LT245/75R17E tires calls for 65 psi all the way around.. and that's what I run..
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2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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09-18-2020, 08:36 AM
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#9
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Senior Member
Join Date: Nov 2017
Location: Mico, TX
Posts: 7,462
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Quote:
Originally Posted by Javi
My F350 with LT245/75R17E tires calls for 65 psi all the way around.. and that's what I run..
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OK, You have teeny-tiny 17" tires on your F350... (have 18" 275 width on my old beater and they came stock from Ford).... anyway you have LRE tires. What does it say on the sidewalls? Thought all LRE tires said xxx lbs @ 80 PSI. I run my tires at 80 PSI all the time, even when not towing and they do ride like a rock... the way a truck is supposed to ride. On a serious note, I have seen that taller tires with the same load rating give a higher payload. Noticed this when looking at a truck magazine while waiting for an appointment. They talked about how companies achieved higher payloads and taller tires were one of the many things... Not sure how they got that but that is my recollection (I am getting old so memory isn't a strong point).
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wiredgeorge Mico TX
2006 F350 CC 4WD 6.0L
2002 Keystone Cougar 278
2006 GL1800 Roadsmith Trike
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09-18-2020, 09:02 AM
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#10
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Senior Member
Join Date: Aug 2012
Location: Waco, Tx
Posts: 5,457
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Quote:
Originally Posted by wiredgeorge
OK, You have teeny-tiny 17" tires on your F350... (have 18" 275 width on my old beater and they came stock from Ford).... anyway you have LRE tires. What does it say on the sidewalls? Thought all LRE tires said xxx lbs @ 80 PSI. I run my tires at 80 PSI all the time, even when not towing and they do ride like a rock... the way a truck is supposed to ride. On a serious note, I have seen that taller tires with the same load rating give a higher payload. Noticed this when looking at a truck magazine while waiting for an appointment. They talked about how companies achieved higher payloads and taller tires were one of the many things... Not sure how they got that but that is my recollection (I am getting old so memory isn't a strong point).
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OEM standard tire/wheel for a 2015 F350 DRW is 17"
https://media.ford.com/content/dam/f...Duty_Specs.pdf
As to the max inflation embossed on the tire... it is 80 PSI... and on my F250 which came with the same tire the sticker PSI was 65 front and 80 rear.. which is what I ran loaded.. un loaded I ran 65 in the rear also..
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2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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09-18-2020, 10:03 AM
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#11
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Senior Member
Join Date: Apr 2012
Location: Portland, OR
Posts: 4,222
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Quote:
Originally Posted by Javi
My F350 with LT245/75R17E tires calls for 65 psi all the way around.. and that's what I run..
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Likely because yours is only a 4x2 so you don’t have the weight of the front drive axle.
__________________
Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360
Visit and enjoy Oregon State Parks
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09-18-2020, 01:27 PM
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#12
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Senior Member
Join Date: Nov 2017
Location: Mico, TX
Posts: 7,462
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Quote:
Originally Posted by rhagfo
Likely because yours is only a 4x2 so you don’t have the weight of the front drive axle.
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The mysteries of life unfold when you have wise folks around you to point out things that ought to be obvious but are not obvious to the somewhat slower such as myself!
__________________
wiredgeorge Mico TX
2006 F350 CC 4WD 6.0L
2002 Keystone Cougar 278
2006 GL1800 Roadsmith Trike
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09-18-2020, 04:22 PM
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#13
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Senior Member
Join Date: Aug 2013
Location: Tucson
Posts: 822
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Quote:
Originally Posted by rhagfo
Likely because yours is only a 4x2 so you don’t have the weight of the front drive axle.
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I think that's right. My 2017 F350 DRW is nearly identical to Javi's except it is a 4X4 (or would that be 4x6) Same size tires as spec'd by Javi, but the pressures for my 4x4 are 70 Front and 65 Rear. So it seems like the heavier front axle does call for higher pressure.
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09-24-2020, 09:18 AM
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#14
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Member
Join Date: Oct 2017
Location: Orange Park
Posts: 55
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I have used the chalk method for many years to determine proper inflation while loaded and unloaded with a great deal of success.
I inflated the tires as recommended by the tire manufacturer.
I then drew one chalk line across the complete tread all tires and drove the truck approx 100 feet. The wear marks on the chalk will tell you if the tires are either over or under inflated based on the wear of the chalk. You continue to do the chalk test when adding or removing air until the chalk line wears evenly across the entire tire tread. I did the same thing with the camper hooked up.
At the end of the day I run 70 in the front 65 in the rears unloaded. 90 PSI on all four corners with the camper hitched up.
P.S. I run 19.5 tires and wheels.
Hope this helps.
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TV 09 GMC 3500 Duramax Dually
RV. 09 Raptor 3602RL
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