That's actually pretty clean. Perhapes you should redo the blue strip in light grey? Also, you don't need a seperate post for each picture, you could probobly keep them in one or two.
Looks pretty nice! The shape of the trailer complements the truck nicely. The silver is nice and consistent, and the back bumper and little spoiler are nice details. Like folks said above, though, the stripe seems sloppy. Could you maybe mask it off and try doing it with spray-paint? That would probably go on more even than the hand-painting. The back of the trailer also seems a bit blank and featureless. Have you thought about getting some translucent red or orange plastic and making some taillights for it? Or maybe putting in some small pattern details like rivets or seams? That might add a nice level of detail to it. Anyhow, just suggestions.... what you have right now is pretty solid!
