For the most part, we use our pressure washer for general cleaning around the house. We've used it on the truck, but found that a truck wash is more efficient than we are.
What I have discovered, is that it does an excellent job at washing the rugs we have in the truck. I just lay them out on the driveway an spray the heck out of them. It fluffs up the carpet fibers an gives them a good deep cleaning.