I regularly took ferrys to the San Juans Islands next door. It didn't cost much. Why not rent a tow dolly (about $50 in ATL) and pickup if necessary, and take it away on the ferry?
Be sure to let uhaul know you are towing something less than 1/3rd of the weight of the truck. They have no idea what you will be towing and won't rent it to you if they think it will be too heavy.
My reverse commuter trike build log: viewtopic.php?t=11384
Fitting glass and weatherstripping: viewtopic.php?f=23&t=6451
Growing various fruit trees, berry bushes, and wine grapes in zone 7b.