The US southeastern states seem to turn a blind eye towards recreational towing of multiple trailers. I see it all the time near the big lakes in GA and SC, with a fishing boat behind a TT or 5W. Online information on this subject is suspect, since some towing advice sites say that GA, for example, does not allow double/triple towing, yet reports of actual inquiries to the GA DMV say there is no such prohibition. Other sites make no mention of a double towing restriction in GA and only give an overall length max (60 ft).