Here is the rack I use for our two Magnum Ui5's:
http://amzn.to/1Q8KIna
It will hold up to two 60 pound ebikes with either a 1 and 1/4 inch hitch receiver or with an optional metal apaptor for 2" hitches, so it should work if you remove the battery from the Radrover first. You can also order optional wheel cradles for fat tires.