Do rv's with cargo trailers have to stop at Ag. stations?

California even requires autos to stop at the Ag stations. Everyone goes through. Sometimes they just wave you on, and sometimes they stop you and ask if you are carrying produce, etc. and..sometimes they want to have a look-see.

It used to be that you could avoid the one at Truckee by going through town. They moved the station past the last on ramp so there is no longer a way to avoid it.