LT has the thicker sidewall. I cant remember, but I think it's 8-ply compare to (P)6-ply. I t will have a more stiff feel than the P rated version. The thicker sidewall is better for off-road protection. LT rated tires are more for trucks/SUVs that are bigger, but you can put them on your runner. I plan to get the LT Grapplers on mine.