Another not so obvious thing to consider when selecting high payload half ton trucks is towing at GVWR. SAE standards do not require handling tests to be performed at GVWR and it should. The super duper payload f150 gets tested at a gvw of about 6700 lbs 3000 front axle 3700 rear. Take that same truck and load it as a normal person would towing a large TT to GVWR 3000 front and 4800 rear. That axle load disparity moves the truck CG a large amount rearward likely to cause handling problems. One way to tell if you have a decent margin of safety is to drop the WD bars and see if you can still travel at say 55mph safely and confidently. If the SAE required handling tests at a vehicles GVWR many vehicles would see a large drop in TWR across the board.