I ordered new G load capacity rims from Trailerwheelsandtires.com for $100 each. I am getting the Sailuns put on them later this week - $971 for four, mounted and balanced with metal valve stems - from Discount Tire. By weeks end, the damage from the Blow Max blow-out will be repaired and we will be back on the road- finally.
The OP's Montana likely has Tredit wheels which is what Keystone pretty much uses exclusively. You can go to Tredittire.com, match up your wheels by picture and read the capacity/specs.
Simply because Goodyear may pay for damage in the event of a blow-out is not enough for me to spend an additional $500. I have insurance on my camper which will pay for damage.