Hey Rick,
I definitely get your hesitation on running wiring from the back of your 2001 Roadmaster Monaco, but since you currently only have a 4-Way connector installed we'll have to route wiring at least from your battery back to the wiring connector to power the Curt Echo In-Line # C79DR. There are other brake controller options out there but they either require the 12V power like the Echo In-Line, or they also require routing wiring into the cab of your motorhome so the In-Line will... view full answer...
Rather than pulling apart the connectors on the Curt Echo # C79DR you could use the Harness # 20147 to connect to your 4-way wiring and run the additional Charge Line # RM-156-75. Then you would be able to simply plug in a 7-Way # PK11893 or 4/7-Way # HM40975 if you still want to have the 4-way for other connections. view full answer...