OK,I took the sand paper to the canvas and abused the surface. I couldn't get it all the way to white because my gesso ground was thin (cheap canvas) and canvas texture too course. No matter. I'll just keep working on it and see where it takes me.
Now that I look at my painting, I'm starting to not like the beach background. There's just no connection there between the truck and the beach - I mean conceptually, not visually. It's just an odd juxtaposition. I tell my students that "it's interesting" is not a good enough reason to qualify as concept. I should practice what I preach, huh?
Now that I've spelled it out, I'm gonna have to take it out. No amount of rationalizing will make this work now. Luckily I'm working in oils so this'll be an easy change!