Does anyone have a way to do a bench press in a truck? I try doing them on my bunk, but I can't get my arms all the way down, so I don't know how effective it is. It's not really a bench press without a bench! I know some drivers carry benches in their trucks, but I really don't have room, and I hate working out outside (I'm female, and I always end up with a bunch of perverts staring at me). Any ideas on how to improvise?