It sounds like you are wanting to fit your Hollywood Racks bike rack on the rear receiver of your towed vehicle which is being pulled by a 2018 Thor Venetian Motorhome. If this is the case, then you will need to find a bike rack that is built heavy duty enough to be used on the back of a towed vehicle. Hollywood Racks carriers are unfortunately not compatible so you will need to go with a different bike rack or use an adapter such as Roadmaster Dual Hitch Receiver Adapter for Tow Bars -... view full answer...