I went with the expensive EMS Progressive one also after reading all of the reviews it was a no brainer. I installed mine right behind the main breaker box, just pulled it out mounted it to the breaker box itself and connected all of the wires right there. Super easy, didnt even have to add any wire just used the wires that was there since they where long and just cut into them and added in the EMS. I did the same thing for a friend of mine on his 5er, mounted it the same way.
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