I can't tell you what the risk of interdiction is, but the law itself is pretty clear. From the OPs post it sounds like they may be starting to enforce.
A one ton is still a pickup - if it has a pickup bed and is less than 11,500 GVWR (and less than 8001 empty weight). Most new one tons won't qualify. A utility body or flat bed isn't a pickup by definition.
"CVC 471. A "pickup truck" is a motor truck with a manufacturer's gross
vehicle weight rating of less than 11,500 pounds, an unladen weight
of less than 8,001 pounds, and which is equipped with an open
box-type bed not exceeding 9 feet in length. "Pickup truck" does not
include a motor vehicle otherwise meeting the above definition, that
is equipped with a bed-mounted storage compartment unit commonly
called a "utility body.""
Here is the California DOT statement on the subject (bold is mine
:
"DO THESE VEHICLES HAVE TO STOP AT THE SCALES?
PICKUP -- It depends on the gross vehicle weight rating (GVWR), unladen weight, and bed of the truck.
GVWR under 11,500 pounds, unladen weight of less than 8,001 pounds, and open box-type bed not exceeding 9 feet in length -- NO.
GVWR 11,500 pounds or more, unladen weight 8,001 pounds or more, or not equipped with an open box-type bed not exceeding 9 feet in length -- YES.
Discussion: According to CVC Section 471, pickups are a motor truck by definition, which is required to stop at the scales per CVC Section 2813. However, all California weigh stations have signs stating: "No Pickups." So, if a vehicle meet the definition of pickup in CVC Section 471, it is not required to stop at the scales because of the signs stating: "No Pickups."
If the pickup has a GVWR of 11,500 pounds or more, an unladen weight 8,001 pounds, not equipped with an open-box type bed not exceeding 9 feet in length, or the pickup bed has been removed and a utility body or flat bed has been mounted, then it no longer meets the definition of pickup in CVC Section 471; it is then a "motor truck" under CVC Section 410 and required to stop at the weigh stations.PICKUP WITH CAMPER SHELL -- NO (May have to stop under certain conditions. Contact California Highway Patrol Commercial Vehicle Section for verification (916-843-3400))
Discussion: It can also display passenger vehicle plates, as long as the cargo in the bed is not being hauled for compensation.
PICKUP WITH CAB / CREW CAB WITH BOX-TYPE BED -- YES
Discussion: The utility or box bed has to enter weigh stations."
You may have gotten away with and may continue to. I might have taken that risk myself, till I learned the violation isn't a ticket - it's a criminal misdemeanor.
Bigfoot 10.4E, 2015 F350 6.7L DRW 2WD, Autoflex Ultra Air Ride rear suspension, Hellwig Bigwig sway bars front and rear