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I also have the 245/75r16 SteelTex E on my 2003 GMC 2500HD.
I have been running 65psi front and 80psi back when towing and the truck, tire, trailer combo works great. Absolutely minimal sway from the big trucks. The only trucks that cause any sway are the old square front trucks pushing alot of air as they come up on the rear of the trailer.
Tires with an E rating have much heavier beads and a longer carcass turnup around the bead with a filler inside the turnup. With 80psi to hold the envelope rigid, the movement in the sidewalls is minimal.
That's why I just smile when people try to tell me some old cars will tow an airstream better than my 2500HD.
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