Tom you've gone from the OE tires to the LT tires and upsized the tires from what I can tell. For me, obviously the 35psi on the door wouldn't work towing a trailer. Now you have the heavier tires (stiffer). Your trailer isn't that heavy (4460). In my mind the suspension of a 1/2 ton needs help from the tires with any trailer of any size. With that in mind I think I would run daily at 44psi like they set it and push it to maybe 50psi loaded and see what that does. I'm kind of a "seat of the pants" kind of guy so drive it, feel it then adjust accordingly. I wouldn't go below 50 or so loaded though I don't think. You've probably looked at this but here's a link to the Michelin load chart if interested (I don't use them
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https://www.michelintruck.com/refere...tion-tables/#/