A platform type rack would be easier to load the Radwagon compared to a hanging rack.
I have a Saris Freedom SuperClamp 4 bike platform rack for a 2" hitch I like very much. It has clamps for the front and back tires with straps for the tire platforms to keep the bike very stable. Saris makes two 1 1/4 platform rack for 2 ebikes at 60lbs each.
Saris Freedom SuperClamp 2 (clamps for tires):
(Link Removed - No Longer Exists)
Saris Freedom 2 (center bar to secure on downtube):
https://www.saris.com/product/freedom-2
I have my platforms that support the tires at max distances apart for my Radrover. Saris does mark an extra long wheel base bike arm for bikes up to 57 inch wheelbase:
https://www.saris.com/product/freedom-long-wheelbase
The only issue I see if you pick the SuperClamp model is trying to secure the Radwagon rear tire with the rack+fender+bag. Picking a platform rack with a center bar to secure on the down tube will work better.
Saris Rack on my smaller SUV with wheel platforms at max distance apart. I added extra 4-way lights because the fat tires blocked the rear lights.
