If it cranks over but won't start, I don't think the circuit breakers either in the MH or the one on the genny itself would be the problem.
I would try to start the genny outside at unit itself. Prime it and see if you can hear the pump if not that may be the issue. Or do you have a heavy smell of fuel? Perhaps the genny is flooded.
2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar