Rather than getting a generator, perhaps look at going solar instead. If your RV has a spot for an Onan, use that space for a battery bank instead. I've been researching and it seems I could ditch my generator and save weight by putting batteries in its place along with solar. I've already got 4 batteries and it seems I could get 4-6 more and be really set for solar only and never worry about a lack of power. The only reason I'd need fuel is to keep the dirt toys filled.
Alternative solution is to get a couple of those quiet Honda generators that can be paired together, depending on how many watts you really need.
But to answer your question, if you have a legitimate autostart for Cummins/Onan it may only work with the Onan generator.
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