As Promised, here is my update and 2 weeks of education that sunk in.
No Liquids, ready to camp
2010 F250 Diesel With 2015 Crossroads Cruiser 33 foot 305RS

Just 5th wheel standing alone on the scale, no truck.

ST tires- they need the MAX pressure if you expect them to perform. Some suggest a TPMS.
LT tires a a bit more forgiving on tire pressure, but not recomended.
Pivioting on your tires is not good for the tires, and will break the belts leading to blowouts. Should try to be rolling when backing up or making sharp turns.
Some tires get labeled China-pops, I have busted Gladiators, Carlisle, and Lions-head tires. 2 of these, I suspect were driver / owner induced.
I have gone to GY Endurance Load range E- ( 3417 at 80 psi), with a trailer # of 10,600, means I'm caring ~78% load on these tires standing still not hooked to the truck. Hooked to truck (~1700 hitch wt.) gets me to ~65% load on the tires. If my math is right.
I will up date my experience with the GY Endurance tires, if anything exciting happens.
Much appreciation to the folks who took the time to add advice, I am human, and can never know it all. Please feel free to add here of IM me if you have questions.
56Jeff