For a bike rack we have a handful of options but what you're going to be wanting is a platform rack that is classified as a wheel mount. This means that it will have the weight capacity needed for your 40 lb E-Bike and then an arm that secures your bike by the wheel and not the frame.
If you only plane on carrying your 1 bike then I recommend using the RockyMounts HighNoon FC Solo Bike Rack for 1 Bike - 1-1/4" and 2" Hitches - Wheel Mount # RKY87RR because it is just smaller and easier... view full answer...