No affiliation but have used https://www.demco-products.com/rv-towing/supplemental-brakes/stay-in-play-duo
For my hydraulic braked class c for many years, and before that their air brake system for my 40 ft diesel prior to the class c. Worked as it should, very reliably never an issue. We just completed Alaskan trip this summer. Nothing broke, no false braking incidents, no troubles in spite of the badly damaged roads, dirt sections, mud, occasional snow early in our departure.Both air and electric systems very robust. I couldn't imagine how the surge brake systems would perform with the bucking and bouncing, sections ornplaces an immediate stop on a curve section or detour where I had no towed brakes... jeep pushing the motorhome in such situations in mud, dirt,uneven pavement, mud, ice etc.
I think it a false economy debating whether you need this or not. Fwiw if I did it again I'd get the electrical version first. Will work on any towing vehicle. My jeep has the guts of the air brake system still in it, lights, wiring, but also the electrical. Had it 14 years. Electrical system would have worked just fine with the diesel had I known better back. In. The. Day.
