In FL non commercially you can tow whatever you want, if it stick out more than 4 feet you have to flag it and use lights at night. Only other requirement is it has to be stable and you have to be able to stop.
all traffic laws are here, basically you have to have the load secured, be able to stop and flagged if longer than 4 feet if non commercial.TKS I googled it but did not find anything about FL