I'd love to see the language that requires lights on the cab for either a dually bed or a trailer over a certain width. Yes, more TRAILER lights are required for over 80" wide, but CAB lights?
http://www.fmcsa.dot.gov/regulations/title49/section/393.11
Note items 3, 6, and 16 in the table...the three center lights are technically separate from the outer two lights, even though Ford put them evenly spaced on the front of '80-'97 trucks...most other trucks with cab lights have the three center lights clustered together and the two outboard lights at the edges of the cab. Per the table, the vehicles this applies to are:
B. Buses and trucks 2,032 mm (80 inches) or more in overall width; and
C. Truck tractors.
Also, take a look at Footnote #15, specifying that marker lamps need to be present on the outermost edges of a vehicle...I don't think the DRW fenders count as "flexible fender extensions", so the marker lights that all DRW fenders have are actually required to be there.
Maybe it's different in other states, but in California, pickup trucks are required to be registered as commercial vehicles and have to adhere to commercial standards.
Take a look at the Hummers, the Ford F-150 Raptor, the Fiat-based Dodge vans, and the Chebby pickups that had Quadra-steer installed. Those all have mandatory clearance lights forward and aft (the Raptor put them in the grille, which per Footnote #1 on the table is actually illegal). For that matter, have you seen a factory DRW pickup (not counting custom jobs, cab swaps, etc) that
didn't have clearance lights on the front and the back?
I'll give you this much...if you have an SRW truck and you're towing an RV trailer that's over 80" wide and has amber clearance lights on the front that are visible above the truck cab, I don't think you need clearance lights on the truck cab. However, if you have a flatbed trailer or a boat trailer that doesn't have front clearance lights, then you do need them on the cab...although I'm guessing Smokey Bear isn't going to say much to someone towing a ski boat with a pickup truck unless he's
really bored that day
