I have I think the exact system on my truck I think exactly (it was on it when I bought it) and I LOVE it!!! When I have heavy loads, I almost never bottom out (within reason) and I live in ontario Canada where it gets -20 Celsius fairly often, and I only have to put a slight amount of air in 3/4 way through winter, other than that, mine don't loose air what so ever!! When I have them filled up to bout 20 psi, I start to notice my ride is def a slight bit smoother on the rough bumps. I had been wondering who makes them, where to get them etc incase anything happens to them as I would replace them ASAP!! Now I know!