Can't tell anything with the actual coach weights, or at least the axle rated weights. Until you have those in hand, run them at the 80 psi for max load. Anything less is risking an early tire failure. You can't "do the arithmetic" with GVWR - at the very least you need axle ratings, if not scaled axle weights.
Are you sure they are LT235/75R16? I've not heard of that size. LT23585 is common, and there is also an LT245/75.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL