Originally Posted by DanMan80
I'm hoping this will work out. I guess I could always use 2" Square Tube 11 ga, but it's def more expensive.
I would put a lock-nut (or a regular nut with Loctite) under the 2x2 first. You don't want a compressed 2x2 responsible for keeping tension on the bolts that hold your rack up!! Put a nut on the bolt and tighten against the metal of the bus, drill 2x2 large enough to go over nut, use large washer and second nut to hold 2x2 in place.