[Mike Finley]

The cheapest way used to be to buy those metal assemble yourself 24'' deep x 48'' wide x 60'' tall shelves, put them together and install them upside down so you had a lip to hold everything on the shelves. You can then attach them to the metal studs of the trailer with self tapping sheet metal screws, doesn't take too many, mayber 5-6 per unit and they are not going anywhere. I suggest though that you toss the press board shelves that come with it and replace right off the bat with plywood.

Table saws and miter saws, put them on stands, and stand them up against the walls and rig a holding system to clamp them in place.