Dwight.
I use this link for a referance. It was issued in 2007 and some of the data may not be up to date.
I pull a 24' stacker and that puts me at a little over 74' combined length. I have not had a chance to test the California State Troopers yet, but I think if you are just passing through and not causing any safety concerns, they might just ignore it. Also I can't imagine they would make you un-hook on the road side.
I HOPE.....

http://www.woodalls.com/articledetai...icleID=1195129