Done a good amount research, and finally found the ford specs for my truck.
My MAX trailor weight is 8200. My GVWR is 6750, and my GCWR is 13500.
So, basically, if we get the camper we are interested in, I will have no worries. But if I go far beyond that one, all the re-calculations have to start over
With a fifth wheel all the numbers change.
If you use a hitch/ball on the back of the truck you should be limited to about 500 Lbs tongue weight, which would give you a 5000 lb max trailer.
Check your Hitch, it should give you max weight and max tongue weight..
A fifth wheel can increase the size you can tow, as it can take 15 - 20%, and is not limited to the 400 - 500 pounds like a tow ball and hitch.
GVWR (Gross Vehicle Weight Rating) is the total allowable weight of a fully equipped vehicle and includes the weight of the driver, passengers, cargo, all fluids, accessories and the tongue weight of the trailer.
GCWR (Gross Combined Weight Rating) is the maximum allowed weight and includes a fully loaded tow vehicle with driver, passengers plus a fully loaded trailer.
GTWR (Gross Trailer Weight Rating) is the maximum trailer weight including trailer plus the cargo inside.
GAWR (Gross Axle Weight Rating) is the maximum weight each axle is designed to carry safely. It includes the entire weight of the vehicle, occupants, cargo, trailer tongue weight and so forth, but now distributed between front and rear axles.
Tongue Weight is the additional weight the trailer adds to total weight of the tow vehicle.