I use the wifes '16 1500 chevy 4wd crew cab short bed with OEM P265/70-17" with 44 psi rating and pulls a 10k trailer. I pump the rears to 44 psi and have no issues with sidewall runover or flex .
Years ago we could get 10 ply rated (E) tires in 15" and 16" tire sizes like our 1/2 ton trucks came with then and tried the E.... Always went back to a passenger tire(P) tire or LT C.
I run Bridgestone Dueler LTH which is a very quiet good wet dry road traction tire . These are sold only by Discount Tire.
For pasture work....muddy worksite work or big snow storms I have a set of the same size Goodyear Wrangler DuraTrac AT tires for those needs.