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Old 03-02-2021, 07:32 PM   #21
CWtheMan
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Originally Posted by rhagfo View Post
Some day you will understand that dry pin weight is NOT a recommended pin weight! Dry pin is the weight of the unloaded 5er pin, it isn’t what the fully loaded pin is expected to weigh. Pin weight only goes up from dry, and should be between 20% and 25% of the 5er GVW.
And someday when you become more familiar with RV trailer building instructions you will understand just why the RV trailer manufacturer MUST provide a recommended tongue weight.
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Old 03-02-2021, 07:54 PM   #22
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Old 03-05-2021, 04:41 PM   #23
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Originally Posted by CWtheMan View Post
And someday when you become more familiar with RV trailer building instructions you will understand just why the RV trailer manufacturer MUST provide a recommended tongue weight.

Well the only "Recommended" pin weight that I know of is the 20% to 25% of GVW of the 5er, there is no hard number "Recommended" pin weight. The number posted in brochures is the unloaded pin weight, and no way a number you can stay at as the 5er is loaded.

Can you cite an example of documentation on manufacturing that calls for a "Recommended" pin weight?
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Old 03-05-2021, 09:55 PM   #24
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Originally Posted by rhagfo View Post
Well the only "Recommended" pin weight that I know of is the 20% to 25% of GVW of the 5er, there is no hard number "Recommended" pin weight. The number posted in brochures is the unloaded pin weight, and no way a number you can stay at as the 5er is loaded.

Can you cite an example of documentation on manufacturing that calls for a "Recommended" pin weight?
FMVSS 571.120 paragraph; S10.2 On RV trailers, the sum of the GAWRs of all axles on the vehicle plus the vehicle manufacturer's recommended tongue weight must not be less than the GVWR.

That is part of the equation the trailer manufacturer MUST comply with during the vehicle certification process.
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Old 03-06-2021, 06:47 AM   #25
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FMVSS 571.120 paragraph; S10.2 On RV trailers, the sum of the GAWRs of all axles on the vehicle plus the vehicle manufacturer's recommended tongue weight must not be less than the GVWR.

That is part of the equation the trailer manufacturer MUST comply with during the vehicle certification process.
Show me one document from a single RV trailer manufacturer that states "The Recommended Tongue Weight of This Trailer is" using those exact words.

They are going to give you an Axle Weight Rating and a GVWR, they may in the broadest terms suggest a percentage range that the tongue or pin weight might need to be.... and they most likely will publish what the tongue weight was as certified when leaving the factory... but you will never see a document that might wind up in court that states RECOMMENDED TONGUE WEIGHT.

One can certainly extrapolate the MAXIMUM LEGAL tongue / pin weight from the sum of GVWR minus GCAWR, but not the RECOMMENDED
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Old 03-06-2021, 05:14 PM   #26
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Show me one document from a single RV trailer manufacturer that states "The Recommended Tongue Weight of This Trailer is" using those exact words.

They are going to give you an Axle Weight Rating and a GVWR, they may in the broadest terms suggest a percentage range that the tongue or pin weight might need to be.... and they most likely will publish what the tongue weight was as certified when leaving the factory... but you will never see a document that might wind up in court that states RECOMMENDED TONGUE WEIGHT.

One can certainly extrapolate the MAXIMUM LEGAL tongue / pin weight from the sum of GVWR minus GCAWR, but not the RECOMMENDED
If you will go back and read all the posts I've made in this thread you'll find the answer is there. For instance, in post #18 I said this; "The FMVSS says a recommended tongue weight MUST be published. They don't say how or where."

Tongue weight cannot be a given figure without proof. The proof will come from actual scaled weights. The vehicle manufacturer established a measured recommendation weight for vehicle certification purposes, it's the only time that weight is valid.

Here is a reference. Your hitch weight recommendation was 2575. That's a tad above 15% of the 15,000# GVWR.

https://www.rvusa.com/rv-guide/2020-...-313rs-tr44606
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Old 03-06-2021, 05:32 PM   #27
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If you will go back and read all the posts I've made in this thread you'll find the answer is there. For instance, in post #18 I said this; "The FMVSS says a recommended tongue weight MUST be published. They don't say how or where."

Tongue weight cannot be a given figure without proof. The proof will come from actual scaled weights. The vehicle manufacturer established a measured recommendation weight for vehicle certification purposes, it's the only time that weight is valid.

Here is a reference. Your hitch weight recommendation was 2575. That's a tad above 15% of the 15,000# GVWR.

https://www.rvusa.com/rv-guide/2020-...-313rs-tr44606
That number is the dry hitch weight, as what the pin carry’s as the 5er left the factory. That pin is 22% of the dry weight, likely the pin will be at least 22% of the GVW, so at full GVWR the pin will likely be about 3,300#.
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Old 03-06-2021, 06:15 PM   #28
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That number is the dry hitch weight, as what the pin carry’s as the 5er left the factory. That pin is 22% of the dry weight, likely the pin will be at least 22% of the GVW, so at full GVWR the pin will likely be about 3,300#.
The trailer manufacturers recommended tongue weight is a weight to verify vehicle certification. That means it has to be a whole weight not some hypothetical guesstimate.

In the reference above, all of the information for vehicle certification is not there. Unless you know how to look for it. So, using the numbers in the reference you deduct the recommended tongue weight from the GVWR and divide by two. That gives the absolute minimum for establishing the trailer's GAWRs. Washout having access to the vehicle certification label I would surmise the vehicle axles are certified to 7000# to satisfy the RVIA 10% tire reserve recommendation. Now add the recommended tongue weight to 14,000# and the answer falls above 15,000#. The bottom line is; it must not be less GVWR.

Remember, the recommended tongue weight is established to support GVWR and nothing else.

(A UVW/dry weight is never mentioned).
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Old 03-06-2021, 06:27 PM   #29
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On my trailer and I suspect many of the newer models there is little storage over or behind the axles unless I choose to fill the galley and fresh tanks. The galley is directly over the front axle and the fresh is just behind it mostly over the rear axle.

Both the gray and black tanks within the 10" drop frame.

Even the fridge is in front of the axles.

So to ever this magical 15% I'd most likely have to empty nearly every thing from the fridge, basement, bedroom and bathroom, grey water and black tank plus fill the fresh water and probably the galley tank.

But hey... I MUST not have over 15%....

BTW, I towed it 250 miles from the dealer with nothing but the propane tanks and batteries in it, rode like crap.
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Old 03-06-2021, 06:49 PM   #30
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I think most experienced RV owners know how this works. We all know how the numbers work and how to calculate them. Cal, for some reason, continues to comment on "regulations", "FMVSS rules" etc. that don't actually address any of the comments made. Reading and real life are 2 different things IMO.
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Old 03-06-2021, 07:09 PM   #31
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I think most experienced RV owners know how this works. We all know how the numbers work and how to calculate them. Cal, for some reason, continues to comment on "regulations", "FMVSS rules" etc. that don't actually address any of the comments made. Reading and real life are 2 different things IMO.
I try to react to the question at hand.

What most are looking for can be found in my short statement in post #8.

Nothing is rock solid with tongue weights. For your application it will be what you make it.


However, vehicle certification is a one time act for all vehicles. It requires information that will satisfy minimum DOD vehicle safety regulations and standards. Therefor, RV trailer manufacturer recommended tongue weights are statutory for that application.
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