ST,

Once again, thank you for the detailed reply!

Not sure why I didn't think of this earlier, but my sudden realization did include drilling holes to attach the plywood to the racks and to use for tie downs... although I wasn't sure if having two holes close together may create a weak spot in the wood.

The U clamps and bolts sound like a really good idea... I may have to look into this.  [smiley=dankk2.gif]

BT