I've used bedliner on the bottom of a few truck cabs, works great! I used the Herculiner brand, nice and thick, sticks good. I scraped all the old nasty stuff off first, washed and dried it good, scuffed the bottom with 80 grit and applied 2 coats of Herculiner using a 2" brush....

As for reinstalling, I use a jig I built that mounts to the lift arm on my cherry picker. An A frame and a sling would be nice, just not enough ceiling room in my little shop..... I used a long alignment punch in the left front and right rear bolt holes, lowered the cab into position and put the mount cushions and bolt is, undo the lift and bolt 'er down.... Use self locking nylock nuts and a torque wrench so the loading is even and the bushings aren't totally compressed.

Other then that, have fun and be careful!!!! Them suckers are heavy!!!!!