Ridge Grapplers PSI? I have a bit of wiggle now

Higher pressure will make it a little stiffer, also more harsh, especially if the front has any weight off of it with the trailer hooked up.
60 psi is about right for the front of a diesel with that size tires.
You're just driving on taller sidewalls, that's all. It's not going to be quite as crisp as with shorter sidewalls.
That's why I get a laugh at all the guys here saying bigger rims don't have enough sodewall to be a truck tire. 285 60 20s are basically the same size as you have, but drive better.
Nothing wrong with those tires though.

So I have towed about three times since this post. First I lowered the front back to stock height and had it realigned. Still feeling the non-centered feel that needed a lot of input from me, or at least more than I was used to giving.

Then I went through and measured everything again and tried different air pressure. Nothing left to do and I have to blame it on the tires now, it me for putting that size on!! I think I have come to the conclusion that the higher side wall is flexing more than my stock size tires (285/75r17 vs 265/70r17). When not towing these tires are amazing! One of my favorites for sure for highway manners and off road use. But I should have stuck with the stock size!

Well we live and we learn and I won't do that again! I did make it a little better by going back to stock height in the front. I also realized that my first measurements after first installing the taller tires was not correct and I had the front of the trailer 1" higher than the rear. Small difference of course but brought it back down to rule out everything else.

So I have one follow up questions to those still reading this I'm running the rears at 80 when towing and front at 60(which the truck calls for). Would going to higher psi in the front be ok? I'm guessing it would give me less side wall flex, but am afraid I wouldn't have as wide of tire patch hitting the ground at 80 up form and would lose some steering control.

Alot of manufactures offer 30-90 day customer satisfaction guarantee on tires, may want to check that also.

One other thing to concider, and I would like to know for sure myself. When shopping for 17" LT tires I emailed cooper tire because I was looking for the highest load cap possible. This was their reply: "Starting in 2019, there was a load cap put on LT tires in the 17" tire line. New testing was done and new molds were manufactured for this."

The only tire I could find with a higher cap was the toyo MT. All others 121 load cap. 31xx lbs per tire. 16" and 18" no problem on higher capacity...

Not at all, I think people are misunderstanding my post about the 1" lift, or not reading back to my original post. I partially leveled it adjusted the front height of my truck. By turning the torsion bars. Before or after that I always have had my front returned to original height of the truck before hitching up the trailer.

I did drop the front back down to stock level and will get an alignment again early next week. Will tow this weekend to see if it makes a difference, but I can tell you it already feels better just driving the truck empty with the front back to stock height. Will be Leaving it stock for sure! Hoping this was the main cause and that the tires are going to work, as I don't plan on buying new tires until these wear out

So you're saying the front end was sitting 1" high before you readjusted? Yes that will affect steering. It means weight is being removed from the front tires. Less weight, less traction, less steering effectiveness.

1" is a huge amount. It's no wonder it felt squirrelly.

Good luck moving forward. I'm pretty certain that everything is fine and just a little change that you very astutely noticed that some may not.
Did you check total toe before cranking them back down? That was merely a suggestion by me. I'm not certain that little of lift would have a measurable effect on toe. It shouldn't have had an adverse affect on stability though.

Well I ended up praying the front air pressure back up to 60 PSI during the tow. I think 60 is where I'm going to leave it just like I used to. Now that I'm home I just at the torsion bars and brought it back to stock height in the front. we have another trip plan the short one but will still be plenty of interstate time the middle of May so I look forward to seeing how it does with the front back down. Thanks for everybody's advice!

^ No, he didn’t. RGs are a pretty mellow tire with respect to void ratio.
Currently grossing over 18k gcvw on siped mudders. No squirmy.
Taller new tires WILL be a little more squirmy than old short tires. Cranking Torsion bars will reduce good handling characteristics a bit.
This is not an issue, just a slight net effect of the T bars and more aggressive tires than what likely came off of it.
OP, you’re fine. You’ll get used to it and tires will wear in.
I’d consider an alignment though with the cranked t bars. You might have a little too much toe in now. Makes for stable driving but could be a little harsh on the tires

You simply bought the wrong tires.

From Nitto:

The Ridge Grappler represents the next generation of the Nitto Grappler family of products which provides the best of both worlds from our mud-terrain and all-terrain product offerings. Featuring a revolutionary dynamic hybrid tread pattern, the Ridge Grappler provides a quiet and comfortable ride while the deep, aggressive sidewall lugs and tread pattern provide capable off-road performance.