If you do some research on P vs. Lt tires you will find "experts" giving different opinions. But on balance they come down on the side of Lts for trucks that pull trailers. Your ride will be stiffer but more stable than passenger tires, which are designed for a smooth, comfortable ride. Also, they are cheaper, not that that would have any bearing on a light truck manufacturer's decision! At a minimum you might replace them with Lt tires when the time comes. Then you'll be able to compare.
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'11 Eagle 320RLDS
'02 F350 PSD Dually 4WD
DW's Ride, '13 Expedition
'14 Denali XL
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