You don't need to unfasten the wire harness brackets on the E450 V10 to replace coil #3. Simply disconnect the coil connector and fuel injector if needed, then work the coil out past the fuel rail using the proper socket and extension.
Add minivan seats to your RV by mounting securely to floor joists with grade 8 bolts. Include proper seatbelts at each position. Elevate seats with plywood platforms if needed for clearance.
For your E450 V10 with 8-16 miles monthly on dusty dirt roads, change the air filter every 12,000-15,000 miles instead of the manual's 30k recommendation. Check and clean it every 3,000 miles.
Motorhome E4OD may use different torque converter than truck version for heavier loads. Verify with supplier using your specific application. Provide year, engine, and motorhome designation when ordering. Replace all frictions and bushings during rebuild.
V10 dying in sharp turns often low power steering fluid or dirty IAC valve. Check fluid first. Clean IAC if fluid OK.