The plate on the truck says "COMB" vertical on the left side.If it's not a commercial vehicle, as long as it passes state safety inspection, I would think you are exempt from most of the above. In Mass for a while ALL pickup trucks needed to be registered as commercial vehicles.
Warning devices are probably reflective triangle or road flares.
The truck was purchased new last year. Does it need a yearly safety inspection? When I lived in NY all vehicles had safety inspections. In CT I have never had a safety inspection just emissions. Do certain vehicles need safety inspections?