We purchased 2 and they have made a noticeable difference. We put one under the rear bumper and one under the beam just to the right of the stairs. The intent was to put it under the stairs, but there are other things there (plumbing, wiring, something) blocking access to that area. At any rate, we do like them! They are simple to use and even if the TT shifts or settles a bit one way or another, you've still got some good stability there. A good investment IMHO.