The writing on the windshield banner isnt straight with the banner itself.
Other than that I like it. The colour scheme looks good, and the neat touches like the yellow FXO logo and yellow front splitter are neat.
Could put some kind of vinyl design on it perhaps. Find one on google to your tastes and trace it with the lasso, fill, and apply to skin.
About logo making. Usualy its just a load of shapes with text put on top, let your immagination run wild and you might be suprised