Holiday Rambler fenders can be sourced from REV Group parts department, RV salvage yards, or fabricated by fiberglass shops. The recurring detachment indicates a mounting flaw - reinforce attachment points during repair.
Holiday Rambler wipers on Ford chassis have fuses in both under-dash panel AND engine compartment power distribution box. Check both locations. The wiper relay is in the engine compartment fuse box. Test by swapping with similar relay.
Codes for entire bank coil malfunction indicate PCM failure not ignition problems. Shipping to PCM repair company for rebuild and reflash is good approach. Discoloration on board confirms internal failure. Common issue on late 90s Ford chassis.