Despite the factory recommendation on the door sticker to use 80 psi front/50 psi rear (cold) I usually ran all 4 tires at 50 psi unless I was towing a 30 foot TT (loaded weight 6450 pounds) and then I bumped the pressure up to 60 for all four. Every tire is wearing evenly and I never felt the rig was unstable even at freeway speeds.
Hi JD,
That 80psi (rear, I suspect) is a worst case #.
As in, GM would have tested your truck pulling Max Rated load, through Arizona in the peak of summer heat.
Then, they'd add a bit of a fudge factor, as many people (not you) don't pay much attention to Max Rated Load.
Living in MI, pulling under the rated load, it should never be an issue for you with LR E. But, that said, you would probably still see a rear tire temperature
difference (sidewall temperature, IR measured), between running 60 vs. 80 psi, even with your load.
For your case , the operating temperature of a LR E would probably still be OK at 60psi rear. Max Load, Phoenix, August first weekend - not so much.
Let us know what you end up deciding to go with.
Rgds, D.