Chance, you are right about the Vegas/Axis having lighter wheels and tires than most Class A's. But to be equipped to replace a tire with a spare, you need not just the tire and wheel, but a sturdy jack and an assortment of wood blocks. Ideally, you would want a heavy duty socket wrench and breaker bar and a floor jack. All that takes up significant space and weight.
The trend in cars went from full spare to donut spare to an inflation kit with no spare or jack, but tire pressure sensors. All because of space and weight.
Back to the OP, even if you can mount a spare, are you sure you want to? Especially since you say you have emergency road service!
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