I think a lot of carriers can handle either hitch (usually have an adapter). I'd look for the carrier you want and confirm it can adapt. I think my Subaru is a 1.25 and I have the Thule EasyFold (there is a thread on this forum devoted to it). The EasyFold came with an adapter to fit 2" hitches as well.
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.
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.
I asked etrailer and the response was that there is no carrier for 60lb bikes that safely works with a 1.25" hitch. I asked specifically about the saris freedom, but according to Sam at etrailer it's a no-go. Good job the bike fits easily into the back of the car when folded!
I'll take a look - youd think it would work -- I have a two bike rack that can carry 70lb total, but states very clearly only 35lb per bike. I'll also get Sam's opinion and why as a massive seller of trailers and hitches he was so certain he couldn't provide one. A rack would be more convenient at times for sure but I don't want insurance issues if it falls off.
Opted for a Saris Freedom 2 with a pair of fatbike adapters. Works great -- some sites still show bike limit at 35lbs per, but it's in fact 60lbs per bike and my mini doesn't seem to give it any problems. I went for the no-clamping version, but note that there's only one option to strap the frame tube to the rack upright (just next to the bike hinge) -- but it does work well and at ~$240 seems good value.