ToughOldFord
The Cold Glow-Plug
That's good to know, thanks for the clarification Warden, I thought I had read that it was a GVWR that determined the usage, must have been something else I looked up.
Actually, the rule is that any vehicle over 80 inches wide is required to have them. That's why all DRW pickups have clearance lights on the cab, along with red clearance lights in the back immediately under the tailgate...for that matter, the F-150 Raptor and GM C/K 1500's with Quadra-Steer have clearance lights as well. Cab-mounted clearance lights were optional on SRW pickups, for people who liked the look and for people towing wide trailers that might not have forward clearance lights (boat trailers, for example).
http://www.fmcsa.dot.gov/rules-regulations/administration/fmcsr/fmcsrruletext.aspx?reg=393.11
FWIW...


