A recent poster on the CT forum had a friend who had been told that the Orion range could not have a mover fitted.
We have a Reich fitted to our 440/4 with no problem at all.
I did suggest that the 400/2 ( two berth ) may suffer from this as it is about 1m shorter than the other models in the range so may have a shorter chassis which could compromise fitment.
Someone replied that they had recently fitted a Powertouch to such a model so that is incorrect also.
So if you are told such a thing it is a load of twaddle.