Although he wasn't an active poster here, he was always browsing through the various boards admiring builds and getting ideas for his next project. On the board here he was Kenny Martin; to me, he was dad. He passed away 2 February at the age of 60.
With the exception of the GMC wrecker, the Revell kits are all '77-'78 model year. The stepside trucks are an aftermarket California Stepside bed, not factory fenders. The GMC wrecker kits are actually a '79-'80, not a '77 as labelled on the recent reissue.
A little late but to add to the asphalt conversation, speaking from a civil tech/inspector role I would definitely not approve of asphalt being laid down out of the truck like that. Unless it is strictly for patch work. Usually you dump the asphalt in a spreader that mixes and heats it up somewhat. For highway mixes a transfer buggy is used that has an internal hopper so that there are no cold joints in the road, just a steady stream.