Motor mover v. Jockey wheel mover

We tow our caravan behind a transit van which is great for towing but due to the lock available on the the transit it is a whatsit to park/reverse. Looking at either a motor mover or a jockey wheel mover. Anybody any comments, whats best? Would prefer something that is a "permanent" fixture do not really want to take anything on or off which I beleive is the case with the jockey wheel mover