We are also looking for a bike solution between Fleetwood 38 excursion and Fiat 500 Pop.
We are using Blue Ox Avail tobar. Considering a Swagman Original 3 Bike Towing Rack for 2" Trailer Hitches - S64600. Slides over the 2" receiver. $142.20 from etrailer. Just need to make a few more measurements to make sure.
Good luck with your search. It would be helpful to share what you decide to go with.
Tom, Connie, & Katie (Wirehaired Dachshund)
2007 Fleetwood Expedition, 300 Cat, Allison 6spd 3000
Fiat 500 Pop toad,Blue Ox Avail, RVi 2 brake