I guess you need to look carefully at your coach s wiring. Wires under the floors will often get wet when driving in the rain, so flooding is not a big concern. On my MH, the only significant electrical components below the floor-line are the high current breakers in one of the storage compartments. Properly dried, I wouldn't worry about them much. And if any of these breakers fail, tracking down the problem is about as easy as it gets.
Inverters, UPC and power management devices are all above the floor level. Even so, they got damp in my bathroom flood. No permanent damage.