I'm looking at adapting this with a 6 lug mounting plate for my wife's H3. Once that's done, I can carry 2 cans of gasoline, a Pioneer toolkit, and a Hi-Lift on it.
Modding this should be easy - have a shop plasma off the 5 bolt pattern mount, and weld a plate with a 6 lug pattern.
http://www.4x4products.com/cargoracks/904.html