Get a tailgate net and throw the boards in a rocket box. or just put in a couple of bars on top, mount a rocket box with a hard tonneau cover or just a hard tonneau cover or a canopy or a canopy or hard tonneau with a shelf and a slide out tray that fits boards and skis under it.
Wrapping your board in blankets....pretty much pansy spazzed...what do you think you are doing in line banging your board to get the snow off, ripping down the bunny hill at 50+mph running over skis and rocks...worse than sliding around in the bed.
Btw your tailgate up and an uncovered bed is your biggest drag.
May seem pansy like, but when You invest over $1000 in your own gear and have other peoples gear banging around in your truck, the last thing I want is to go back there and see a chip or something worse that could be avoided. I would much rather damage the board on the mountain than on the way....