There are several threads on the IRV2. My current motorhome is a DP with air brakes, when I set up my 2015 Jeep Wrangler, I had a gas powered Class C and it worked great. Trying to use the Stay and Play with my exhaust brake activating my brake lights, I have over heated my TOAD brakes several times on long downhill grades. For now I have turned the inertia setting down as low as it will go, so I am doing without any real TOAD braking. At sometime in the future, I will change out my Stay and Play for an Air Force One. I am waiting to find a deal on the AF1 as the trade in offer was minimal. Until then I will grumble and moan a little. JH :)