Furnished content.
(from Lumberjocks.com)
Looking forward to some potential RV travels this summer but need to still be productive on the drive days (as the passenger not the driver!!). I wanted a work surface that I could place my laptop along with reference materials. I put together this surface that is made from 1/4 inch plywood that I framed with maple. The base (birch) is a rectangle with half lap joints and then rounded over as these will rest on the seat. 
I also added a few little supports (more pictures frame cutoffs being put to use!) although likely not necessary.
The front edge will rest on a ledge on the dash (have a section of grey pipe insulation that I'll use to cushion vibration). Finished with Odie's Oil. The “desk” is very light but should easily support my laptop and materials. For once I didn't “over build”!