Bike Rack Sizing is extremely important!
If you are looking to install a bike rack to a caravan or motorhome with pre-installed rails.
You must first measure the distance between the top and the bottom rail.
If you are looking to fit a bike rack to a motorhome without pre-installed rails.
You will need a proffesional to measure up your motorhome to make sure there is provision inside the motorhome to take the weight of your desired bike rack configuaration. Many manufacturers will state a maximum loading weight for the rear of the motorhome wall.