Original 1974-75 Dodge Motor Home Chassis Service Manual Supplement. This Shop Manual Supplement has updated information and procedures and was meant to be used with the 1973 Service Manual for Full Coverage. It covers the RM-300, RM-350, RM-400, M-300, M-400 and M-500 RV Models. It is in good condition with minor wear and soiling from use in a Dealership [see photos].