Yes the Voyager RV Side Camera w/ Night Vision # VCMS50RCM that you referenced does work with the Jensen JRV9000 that you have now. view full answer...
Here are the answers to your questions about the Roadmaster BrakeMaster System w BrakeAway for RVs w Air or Air Over Hydraulic Brakes - Proportional # RM-9160:
If there is a break-away, how does the air from the RV get capped so I wouldn't lose system pressure?
If a breakaway were to happen, the air could blow out the back of the RV. If the air patch cord breaks away at the coupler on the RV then NO. If the patch cord were to break in the middle of the cord itself then yes the air is... view full answer...
The Tekonsha P3, # 90195, is a great brake controller. It is a proportional controller which means it applies the brakes as hard or as light as the motor home is braking. This is the safest way to stop and it reduces wear and tear on the trailer and vehicle. I have linked a video review of this controller for you.
From my research I have found the Coachmen Cross Country is on a Freight liner XC-Series Or SL Series so you would need this adapter. Installation for the trailer brake controller... view full answer...
I have attached for you below a diagram of the CoachLink included with the Demco Air Force One Supplemental Braking System with Wireless CoachLink part # DM26VR. It includes the new two wire reed switches. view full answer...