AS stated, it's really not rocket science,just simple addition and subtraction. I weighed my truck ready to go camping.....everything full, all parties in and it weighs 9420#...Rear axle had 3860 on it, front axle had 5280 (rated at 6,000#) my pin weight is 3300#, add the 3300# pin weight and the 9420# gives total truck weight of 12,720#, which is 1,280# under my trucks GVWR, ( don't have to worry at this time about RAWR, because again, I'm under trucks GVWR)...rear axle weight was 3860# plus the 3300# of the pin weight, puts me 7190# rear drive axle, which puts me 2560# under my RAWR...Total of truck and 5er together is 9420 plus 5er, which weighs 16,150#, for a total of 25,570#, which is well below my trucks GCWR of 37,600#....So I don't need tires that will handle more axle weight, though my axles will handle 11,400#, from what I've researched....so if I ever need it, I will use Chris's suggestions, which are very good.
simple math and a little common sense can help one easily match a tow vehicle with whatever it is theyr'e going to tow without having to buy "extra stuff" to make it work...