Typically there will be a switch that selects either front or rear ac as the one to be powered from the house 30A supply. Only one ac gets powered from that source.
Also typically in Fleetwood coaches, the generator can power the rear ac directly while the front ac receives power from the main house 30A supply. The 3-way switch needs to be in the "front ac" position to do that. That allows operation of both acs when using the generator.
The Intelletec you have is probably a power load manager integrated with the thermostat. The idea is that it sort of alternates the two acs by sharing one power source. If you are willing to do that manually, you can replace it with a different t-stat, but you have to make sure the power wiring that is now handled through the Intelletec gets routed correctly. It's been ages since I looked at one of those, so have forgotten the details myself. Probably somebody else will join in with some up-to-date advice.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL