Towing or packing a Smart Car on the back of a Class A

I have had a Smart since 2014 and have towed it all over the country on a dolly. This works for me as I can also tow our Honda CRV or DWs Camry if I choose. Last year I bought a Featherlite trailer so I can now take our Mercedes or F-150. You will never know the Smart is there unless you look. I originally bought the Smart to take with me to the Drag Races because it fits in the same space in my 32ft enclosed trailer as a golf cart and unlike the golf cart has a/c and tags so I can drive it to town if I wish.