We ordered our 2007 Mercedes ML320 CDI and it was built in October 2006. It was not until three months later that Mercedes discovered the brake control wiring had not been run the the drivers footwell. Rather than tear out the interior of the car, I purchased a Tekonsha Prodigy RF unit. The main part was attached to the 2013 25FB International Serenity street side of the 'A' frame on a pair of standoffs to clear the support bolts for the Hensley hitch.
Pairing the hand control to the brake unit has been reported to be challenging in some vehicles (especially Mercedes), but we had no issue doing the pairing.
There is an issue however with our vintage Mercedes that the four-way flasher and turn signals interfere with the RF connection and the trailer brakes pulsate in time with the flashers. There is no work around.
Due to weight issues with the 25FB and the Mercedes when the trailer was loaded for camping, we had to acquire a more robust tow vehicle in terms of weight capacity and that was a 2012 Dodge 2500HD Cummins truck. The Prodigy was removed as the truck's built in brake system worked with the usual direct connection.
When we traded the 25FB in on the 2014 31' Classic, I kept the Prodigy RF brake system as well as the Hensley hitch. We installed a ProPride hitch on the Classic.
About two years later, we purchased a 2015 23D International Serenity that had a 1,300 pound lighter GVW rating than the 25FB. We installed the Hensley on the trailer and the Prodigy was attached cross frame to the front panel of the battery box. The remote and brake control box were still paired despite being in storage all that time. The pulsation with the turn signals has continued with the Mercedes.
The brakes work just fine whether if there is no turn signal activity. Of course, one should already be slowing down before a turn signal needs to get energized....
I would suggest calling Tekonsha and inquire if there are any known issues with their Prodigy RF brake control and your proposed specific model tow vehicle.
We may decide to migrate to a Tekonsha Prodigy 3 which will require lots of work running the brake control wire to the front of the car.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels