California's produce inspections are basically a waste of time and money. I am sure that sixty or seventy years ago they were of good intention. Today most States follow the same procedures in planting and growing produce and fruits. The Agricultural Inspectors may target some vehicles from certain states but I doubt it.
A bigger hazard for all states are pests that infect our forests and woodlands. Dimensional lumber and bark/leaf free wood is acceptable going from state to state and from the US to Can and vise versa.
Federal inspectors are a different story however. They can be set off for any number of clues and are prone to searches for pests.
In all of our travels to all 49 continental states, Canada and Mexico we have been stopped for forbidden fruit twice. Once coming from Seniota into the US. Had a bag of California grown and labeled apples for our girls and once when my wife complained about having to pay $1.85 for A lime in British Columbia to be used in my V&T. Inspector spent about 10 seconds looking in the fridge and fifteen or twenty minutes just looking at the features in our rig(after asking if he could just look). It could have been a ploy but he asked a lot of what I felt sincere questions about RVs and RVing in general.
So don't get to worried about the inspection stations.