More Info......
IF you don't have the 5th wheel and are trying to calculate what you can tow etc.
Get the truck weights (F/R axle)
The difference between trucks rear axle as weighed and the trucks RAWR will be the 'payload' available-------that will be trailers pin weight.
Keeping in mind the trucks rear tire MAX Load Rating at MAX PSI (on sidewall).
And the trucks GVWR
Then you have a starting point....
Look at the 5th wheels GVWR (on Data Plate) and using 20% of that number will give you a 'guesstimation' of what the 5vrs 'wet' pin weight would be.
Typically you want at least 20% pin weight for good towing..lighter pin weights can result in 'chucking' (Actual pin weights can be higher than 20% but it's a good 'guesstimate' number without actually weighing)
Example:
Truck weighs 7000# camp ready (you, passengers, any stuff in cab, hitch(200#), and fuel) Front axle----3800# Rear axle---3200#
Trucks RAWR is 6200#........so that leaves 3000# payload
Tires are rated at 3200#/each (6400# total)
Truck GVWR is 10,100#
Trailer GVWR is 12,000#
20% is 2400#
So truck has enough payload (3000#) for the 2400# pin wet
Trucks rear axle (Rated @ 6200#----weight is 3200+2400=5600) has enough capacity for the 2400# pin weight
Rear tires have enough load capacity at max psi (Rated @ 6400#----weight is 5600#) for the 2400# pin weight
Truck has enough GVWR (Rated @ 10,100#.....weight is 7000+2400=9400) for the 2400# pin weight
>>>>>>>>>>>>DISCLAIMER><<<<<<<<<<<<
The above is just an example of the math..numbers are made up to fit scenario
Real World numbers WILL be completely different
