Here’s a couple of conventional cabs with a sleeper box installed. I don’t know who was the manufacturer of the 46” boxes were but they are in scale and look great.

The maroon DC Autocar with axle set forward is Sheepscot kit number 95127 with a 199” wheelbase. It has dual air cleaners and exhausts and is shown pulling Sheepscot 32 foot trailers kit number 95082.