Installing the Tekonsha Prodigy RF Wireless Trailer Brake Controller w/ Bluetooth will not require any modification to your 2011 Mercedes GL 350. You already have a 7-way so the only thing you will have to do is mount the brake controller on the trailer and plug the 7-way in. The remote plugs in inside your vehicle and pairs with the brake controller.
If you would like to avoid mounting a brake controller on your trailer, I recommend the Curt Echo Wireless Trailer Brake Controller # C51180... view full answer...
Welcome back! I checked with Rhino Rack and they recommend the 52" Long Fairing for Pioneer Platforms item # RR43251. This will work great with the 60" Long x 54" Wide Pioneer Platform item # RR95TB you ordered last month. view full answer...