We have a 10-inch drop/rise accessory receiver which allows us to flat tow the jeep and attach our bike hitch for our mountain bikes. We are using the Pro Series double mount bike carrier with the heavy duty bike cover. Our first bike cover shredded pretty quickly. It is worth the extra money for this heavy duty cover.
We store our ebikes in the back of the Jeep right now but we are considering a hitch to mount on the back.