The Redarc Tow-Pro Elite Brake Controller # RED44FR will work for your 2019 Mercedes GLS450. I like this controller because the main unit will be installed out of sight with only the control knob showing, which will give your Mercedes-Benz a nice factory look. To install the Redarc controller you will need to remove the factory brake control port and hardwire the controller. There is not a plug and play pigtail available at this time. view full answer...
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