I found this on EBAY and may consider it. It is not as nice as the one Bill uses, but it still seems to be pretty good. The only thing would be mounting a plate to the bottom for support, and the price seems very good.
http://cgi.ebay.com/TRUCK-LAPTOP-NO...yZ116346QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/TRUCK-LAPTOP-NO...yZ116346QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
