Streetwize All Terrain Heavy Duty Trolley — S.K Camping & Leisure
Kronings Camper Trolley/Motor Mover Robot for Caravans and Trailers - YouTube
The M18 electric powered trailer dolly is a simple and inexpensive tow tug.
4X Wheel Skate Dolly with 4 Swivel Castors, Foot Pedal, Carry Handle, Vehicle Positioning Jack Tyre Lift Trolley for Car Van Caravan Workshop Garage : Amazon.co.uk: Automotive