Foretravel Diesel Motorhome, Powertech Generator, Allison Transmission Oil, Fuel, Air Filter change

NOTE: I've since found out that 15w-40 is a better weight of oil for a big cummins engine!
I take on a few service items on my Foretravel Diesel Motorhome. Engine oil change, air filter change, transmission fluid and filter change and fuel filter change. Generator oil change, fuel filter change and air filter change. Pretty basic stuff but it might be an interesting look into servicing a big truck engine.