Just another data input for ya, Hank.
I have owned my RVi brake system for 8 years or so and towed my Kia Soul about 25K miles with zero issues. The only reason I chose it over others I looked at was that the response time is essentially zero; i.e., when you apply the motorhome brakes, the air-actuated cylinder in the RVi brake reacts almost instantly ......... I liked that feature for the emergency stop scenario. When I recently traded motorhomes I already had my toad braking system in hand ...... it doesn't care what is pulling the Kia, of course.
It takes me less than 5 minutes to set the brake up in the Kia and about 1 minute to remove and store it. The Demco mentioned above would be even better ......... like zero time. I am a DIYer so the RVi works for me. As mentioned, there are a LOT of systems available; I have never read a negative comment on any of them.
One tip: I did not believe the Kia was doing its share of the braking task so I "upped it" one notch (after consulting with the RVi tech support folks) and was pleased with the result. (That "customization" is likely a standard feature on all toad braking systems, I'd wager.)
Good luck with your search and good times and safe travels to ya.