With Brian’s OK, I will respond, not only to his original question but also make a couple of comments about his pictures.
Since this is a truck series, I would add two pictures in a similar vein with large swatches of color and points of interest that are more design than pictorial - one picture would be taken of the front of the truck and one at the back. These would wrap up his semi-abstract view of the truck.
In regards the pictures themselves.
The ideas of color and composition are great. Clearly the OP is working at getting interesting images with impact and is not just taking a snapshot. Where these fall a little short is the composition and attention to depth of focus.
In picture #1, there is a busy, over-bright background behind the orange signal light and the light itself is OOF. I would have considered moving to the left some to make the front part of the truck the background for the light and be certain that the light was in focus. The picture was shot at f4. Move this up to f8 or f11 and you’ll have a much greater DOF so the words and the light will be in focus.
In picture #2, the gauge is nicely positioned at an interesting angle against the colors of the truck but the edges of the gauge are cut off., randomly, by the edge of the frame. It is ok to truncate an object but make the trimmed piece have some design purpose, make it symmetrical, make it asymmetrical, but in any case plan how you want it to look.
In picture #3, the picture was again shot at f4. This kind of picture calls for a control of the DOF. In this case, the man in the background draws attention but he is oof, burnt out and his attention is elsewhere. Also, there is a person reflected in the paint just above the H and that seems caught by accident also.
Overall I think these are a good start at an interesting series and really bear working on. These comments are made because, IMO, the OP is really working at making a good picture and out of respect for his intention and the good results he is getting so far.
Cheers!