In California the rule for pulling two trailers is 75' length limit providing neither trailer is over 28.5 ft. If one of the trailers is over that length then the over all length limit is 65 ft.
As far as odd towing combinations go, check out the guy below. Motor home, quad, pickup truck and a trailer with an airplane on it!!!! Saw this on highway 99 northbound a bit over a year ago.
http://i1088.photobucket.com/albums/i322/Steve_Scarboro/plane1_zpsba4c19e5.jpg
Sorry for the URL but my iPad won't let me use the upload feature
Steve
