I've done the Grand Coulee dam trip before. That actually sounds like fun. I've considered getting a canopy for my truck and turning the bed into a camping spot with mattress, partly because I work 12-hour shifts and drive home from work so exhausted that I'm frequently having dangerous microsleep events where I pass out for a couple seconds at a time, so if I'm completely beat, I can just hop in the back and nap for a couple hours before driving 30 miles home.