There isn't any issue with installing a supplemental braking system on your 2014 Lincoln MKX like the Demco part # SM99234 and a lighting kit part # RM-15267. The two systems do not interfere with each other at all. view full answer...
Glad you got it all set up but that's interesting your Rambler's fitting is a different size. The Demco Air Force One item # DM23MV you purchased is specifically designed for the factory BrakeSync fittings. I don't know if yours got swapped out by a previous owner or what and I have no idea what size it is. The easiest way to correct this would be to swap the fitting out on your RV.
I recommend taking the Air Hose item # DM97ZR to your local hardware store and matching the male fitting... view full answer...