Originally Posted by OldCoot
But to my feeble mind, the actual weight is needed regardless of the meaningless percentage. Being a little fictitious, what makes the difference if it is 10% or 30% as long as the actual weight is within the lawyer stickers?
What we are trying to do is to answer the age old question; "Can my truck pull this?" BEFORE they buy it.
By using the floorplan's dry weight and pin/tongue (Yes, I know meaningless), we think we can predict within a percent what the pin/tongue load will be for an camper at its GVWR.
For example using the attached brochure from 2010 (since it is there) and we look at a Flagstaff 8528RLWS with a dry weight of 6830 and a dry pin of 1187 we get a pin ratio of 17.4%
At its max GVWR of 9187, THAT MODEL of camper should have a pin fully loaded around 1600 pounds. If your existing truck (loaded for camping with family, gear, hitch, gas, etc.) does not have a REMAINING payload of 1600 pounds, that model/floorplan is too much for your truck.
So the calculator seems to be running fairly close with verified numbers (except for my mistake).
STILL, IMO, the best way is to use the "optimum" 5th wheel pin ratio (20%) times the GVWR and see if you can carry that. (12% for a TT)
Then you can play with loading to move the weight around some.