JStelly: I have two thoughts... I've seen two RADs - one Mini Step thru and Mini 4 on the back of a Sprinter Van. So I know some racks will hold them. One consideration when putting close to 150 lbs on the back of a travel trailer is insuring the tongue weight will remain within the 10% to 12% range important for control of your trailer. Also, we purchased two RAD folding bikes which go inside our Highlander, to keep them out of road grime on extended trailer adventures.
By-the-way... ebikes are great! I've ridden my RAD Mini 4 (folding) ebike 1,000 miles since it arrived in October.
2018 Escape 19'er & 2018 Highlander
Not all who wander are lost