BTW, since I don't know squat about larger motorcoach tires, not saying this is what I would go with, but does this link include the tire and the wheel (rim) or just the tire, and the picture for visual aid only?
75LBS that they list in product description certainly doesn't seem like enough weight.
https://www.amazon.com/Roadlux-Posit...dp/B017XTXGQK/