Amazing what some paint and TLC can do to an otherwise unremarkable blisterpack truck. Cars and Trucks (my truck population FAR outnumbers my cars) that I once turned my nose at, I find myself now looking for.
Decoration sources are Model Truckin and Graphics on Demand. I think Microscale may offer some truck decals as well. I use Don Mills wheels almost exclusively as I like the real rubber tires on the wheels and he also offers lots of detail parts to replace broken items or enhance, all reasonably priced.