Tire/wheel on an Axis or Vegas are no bigger or heavier than those of 1-ton vans like mine -- 225 tires are actually a little smaller than my 245s. They are also smaller than those of many HD pickup trucks which have spares. Torque on 8 lugs are pretty much the same too. Since I remove mine to work on brakes, etc., I wouldn't have a problem changing a tire in an emergency. I would certainly want a spare even if I couldn't change it myself.
A concern is that modern motorhomes are very tall with high center of gravity, so jacking them up on side of road may be too dangerous for most owners.
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