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.
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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS
viewtopic.php?f=5&t=13225&p=134742Simple Spring select
viewtopic.php?f=5&t=11815LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12