the lights aren't matters of taste like paint colors, they're mandated by the DOT for a reason > identification of vehicle size in poor visibility conditions -safety-
the federal statute was passed [1968] to standardize
Conspicuity Systems, note it specifies identification lights to be
exactly 3, the
Canadian rules are the same, and although the clearance lights started earlier there was no previous reg that specified fewer ID lights .... the page Jake shows is what was done from the factory by the 60's on trucks that were the 80" width specified
Bill