I know what you mean about trucks and not being able to stop. There are a number of shots I'd love to get but cant stop on the road anywere. I think my problem might be, I don't want that postcard shot, I want something a little different. I've been to some beautiful places and just looked about and thought "where's the shot?", "I've seen that on a postcard" or "My missus will get that wit her P&C". There's always a photo there, even if you have to look like a fool bending over a wall or hanging from a tree, It's there. :-)
Maybe my mind is more suited to indoor lighting and tabletop or macro shots. Maybe I'm just to fussy and looking for something that's not there.