I purchased one of the Stealth Cam Wireless Backup Cameras (WX2-424974) to use at times, its great as it is very small and magnetic so you can mount it just about anywhere you want. Completely wireless and has a very extremely good color camera. Great for night or day, Rechargeable and last a long time. About the same price as the Hopkins that you where asking about.
TT: 2014 Forest River 27VRL Super-V
V-nose TT w/Rear Living area, 2 slides, Equal-I-zer 4 point hitch #10000
TV: 2011 Chevy Silverado Z71 Extended Cab AirLift 1000 w/WirelessAIR