I think the potential risk is that with many RV wirings, when you start the engine, it pulls from both the engine and the house battery. If you are plugged into shore power, there could be a risk of pulling too much power. I don't know how likely that really is or not.
With my clipper, my boss is actually wiring it so the engine only pulls from the engine battery by using a delay switch. After about 20-30 seconds, once the engine has started, the house switch will connect and the house battery will charge from the alternator. There will be a toggle switch in the dash so that if the engine battery is dead, I can jumpstart the engine from the house battery - otherwise, I'm only pulling power from the engine battery.
