Thanks! The truck paint is the Colorado achievement with blue with colour-shifting purple lacquer above and then a green-gold metallic fleck over everything (only really visible in direct sunlight). The trailer is just one of the ones in either the base game or the Stripes DLC, matched to the truck, but with the light blue from the truck side. Can't cross-fade trailers, or do fancy lacquer effects, so solid colours will have to do!

Cool combo !