I would say make sure your tow lights work and stay under 55 if towing anything in CA.

I did get stopped once in CA for towing over 55, and CHP officer gave me a warning, after I told him I wasn't paying attention because I got a call an hour earlier that the doctors wanted to pull the plug on my mothers ventilator. He knew I wasn't paying attention because he said he followed me for 3 miles before driving up in front of me to get my attention. I figured I was lucky and have since never drive over 55 while in CA.
GregM