I got a speeding ticket near our home in TX while driving our 38' DutchStar DP that has a GVWR of 27.4k Lbs.
The county mounty didn't say a thing to me about only having a class C TX license.
But, since reading this thread, I'm now planning to get my class B.
I had 3 bicycles on a receiver hitch bike rack, and he warned me that my license plate wasn't visible.
Since this was a local stretch of road that we do this on all the time, I went home moved the plate and lites to a much higher(abby normal) location so as not to risk a future ticket. I also turn on the exhaust brake when going down that steep hill.