(I may have misinterpreted your question)
Originally Posted by Imnewhere
Is it possible to just use our travel trailers electrical system. Would it be to hard to transfer it? It's 30 amp anyone have step by step guide on how to do this?
The RV panel is likely sized for the camper. You may be able to add 10-20% to the load, lights &/or one small appliance. Limited.
If you are building new, in the bus, it may be practical to size the new panel to include one 30A RV circuit. Power the RV through a larger bus panel.
Installing a distro panel on the bus is necessary, either way. The only change, I suggest, is that the bus's panel size be increased. 60A, for example.
Everything you currently plan for the bus branch circuits, remain unchanged, adding only one dedicated circuit (1P30A) to the build plans, to accommodate the RV.
A 2Pole panel may ease the task of splitting the loads . Either separating the bus from RV OR
equally throttling both, depending on the utilities available & builder's choice.