A few day ago some commenters expressed concerns about how you’d load and unload the Fatmax Portable Truck Box if all 42 gallons of stage space was filled with tools. One way would be to use a lift cart like this one from Northern Tool.
This lift cart will raise 300 lbs from 8-1/4″ to 28-3/4″ by pumping a foot pedal. To lower the load there’s a handle-mounted pressure release. The platform measures 27-1/2″ by 17-3/4″ and is 1-3/8″ thick.
Northern has several inexpensive hydraulic table carts that can handle from 300 to 1000 lbs in the $200 to $300 price range. The pictured lift cart runs about $190, but it’ll cost you $75 to ship so I’d recommend going to one of Northern’s brick and mortar stores if there’s one close to you or find a different source.