....like why not try asking the previous owner about any ideas they might have had about mounting the box? I'm sure they might be able to help you out with a tip or two. Agreed that MLU is a wonderful fountain of information, but to actually ask the people who were working hands-on and know the truck well? Might not be a bad idea...
...and just for that I won't tell you what Barry and I thought up to mount it...

Perchance this weekend though....
Tim