I have built the Sandiego-semi-truck with a few "Extras" that I added.
I reduce the size to 70%.
I use some light coloured wood for the windows.
I add a spare tyre behind the cab.
I modify the trailer so that it can use 2 ramps which can be used for a toy to drive onto the trailer. The ramps are stored between the two pieces on the trailer.
I also added some lights on the roof.