Are my calculations wrong?

Thanks for all the advice. I have not yet even come close on deciding what to buy. Actually I will be going to the Hershey, Pa show this fall and will start getting ideas for floorplans, etc. I also plan to weigh the truck at a better scale that will give me the axle weights. Maybe then I'll be better prepared for the show and the dealers who are going to be telling me I can tow anything. Although I am still somewhat confused on the numbers (seems that there are several different formulas that have been suggested), I believe that I am getting a realistic picture now. In no way do I want to go over the weight allowances. Life is too short to take chances just to gain some room for stuff that I can probably do without anyway. Thanks for all your suggestions. I will probably get back to yall after I get more accurate weights.
Be safe out there!