here's Pelican 1430s on home made WWll era styled racks that are as utilitarian as it gets. racks have a folding foot for empty running, are at the same level as rear pegs for extended length cargo, and you can strap any odd shape on imaginable...gas cans, ammo cans, road kill for a snack later... Pelican cases are waterproof with an atmospheric vent and are warranteed for life at $55 each. IMHO a 500% better solution at 1/3 the price. top case in picture is a 1300 for tools, glove box... ect.
I also see aluminum oversized attache type cases being sold at Lowes, Harbor Freight ect... that would work well mimicing mini Metal Mule type expedition type cases at around $25-30 per case...but iffy for water proof. The Pelicans are the way to go...these are the pro cases EMTs, photographers, expedition folks, ect... use.
Pelican's warranty is:
"you break it, well give you a new one".
here's the horse's mouth:
http://www.pelican-case.com/?gclid=C...FRssVAodIlnemA
here's the discount source:
http://www.pelicancases4less.com/list_case_pelican.html