I also have a Powrtouch Mover on my (twin-axle) van; I use a Bulldog Titan wheelclamp, and I have found I can get this on any of the wheels (inc the front pair with the mover rollers), so you should be OK on your Bailey. The Titan is a very heavy clamp, I think the best of the clamps for security. For fitting you can either 'fold' to fit round the wheel, or dismantle more fully and reassemble around the wheel, depending on your clearances. Can be fiddly till you get used to it, but worth it.
Good luck!