You'll need four weights to find the data you need. First weigh the truck and trailer together. Then pull the truck onto the scale with the trailer off the scale and weigh the truck while hitched. Next, DON'T MOVE ANYTHING. Uncouple the weight distribution bars and weigh the truck without WD levering the hitch weight to the front axle. Then pull off the scales and unhitch, return to the scale and weigh the truck "without the trailer". Those numbers will give you these weights:
1. Total rig weight (GCWR)
2. Truck weight (GVR)
3. Trailer weight (Rig minus truck)
4. Tongue weight (truck hitched minus truck alone <WD bars hanging loose>)
5. WD Tongue weight (truck hitched minus truck <with WD bars tensioned>)
If you want and have the scale time, you can also pull the truck onto the scale "front axle only" and weigh both with the trailer hitched and not hitched. That way you can also get (through some math calculations) the front axle weight, rear axle weight, and if you have more time, tension/release the WD bars with only the front axle on the scale and you can get the amount of weight being applied to the front axle by the WD bars.
Another, much easier way to weigh is to find a CAT scale and do it with the "three pad scale" where you only need three weighs. Pull the truck front axle on pad 1, truck rear axle on pad 2 and trailer axles on pad 3. Weigh the total truck/trailer, release the WD bars and weigh total truck/trailer and then unhitch and weigh truck alone. With those weights you can get even more information than with the multiple weights on a single pad scale.
Good Luck, and yes, knowing the information is really worth the hassle and effort.
ADDED: It seems much more complicated with a single pad scale (and it is) because with the 3 pad scale you're actually getting 9 weights when you do as I explained. Each pad, 1, 2 and 3 give you information with one "ticket" which would require 3 "tickets" on a single pad scale. So 3 "3 pad weights" equals 9 "single pad weights".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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