I am pretty sure your older rig doesn't have rims capable of 100psi tires. Probably 80. So unless you get new rims, you will be stuck with E tires, I think. And I think your rig fully loaded would probably have around 13000 lb on the axles - hence 3200 lb per tire. I run Michelin LTX (I think) which are rated at 3042lb. Not enough for you.
I may be wrong on your wheels but something to check.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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