Don't know if you're aware that
... looking for comfort, ride quality, low noise, etc.
kinda contradicts
... LT rated, 2300lb GVWR. They swear to be damned they are adequate for the vehicle and it’s all my fault for the error.
LTX in Michelin evidently does not mean Light Truck, 10 ply. My rear axle rating is in excess of 6000lb,
and my argument is these tires need to be rated to meet or exceed that amount.
Their argument barely holds a sip of H2O ... they put on '1500' tires (you were not fully aware that that's what you asked for)
that are adequate for a 1/2 ton pickup truck, especially if it's usually empty-bedded and hardly ever tows / hauls anything heavy.
LT tires are for towing / hauling LOTS OF HEAVY STUFF. Of course a truck that works or plays HARD needs LT Load Range E tires.
In LT245/75R16, Load Range E, I'd get FALKEN WILDPEAK A/T4W, looks like the best bang for the buck
In LT265/75R16, Load Range E, the MICHELIN DEFENDER LTX M/S (NOT M/S2, just M/S) is available,
but once again, I'd recommend the FALKEN WILDPEAK A/T4W, a more capable tire for less money
In either size the Sumitomo Encounter AT2 also comes in Load Range E, also lots of tire for the money.
There are of course other good choices, like
BFGOODRICH ALL-TERRAIN T/A KO3 (KO2 would also be acceptable, this time)
TOYO OPEN COUNTRY A/T III
FIRESTONE DESTINATION X/T
NITTO TERRA GRAPPLER G3
GOODYEAR WRANGLER WORKHORSE AT2 (NOT AT without the 2!)
GENERAL GRABBER A/TX
My bias (is it apparent?) prioritizes extra capabilities for contingencies.
If yours does not, more power to you; use TireRack or SimpleTire's choice matrices.