Simon Rohrich from Elliptical Mobile Solutions sent me a message to say they released a self contained data center module in April, which is much as I described in my blog. Their Relocatable Adaptive Suspension Equipment Rack (R.A.S.E.R.) is a ruggedised 42U cabinet which can be moved with equipment in place. Cabinets can be used outdoors and be added side by side as required. From looking at the diagram of the unit, it appears to be a sealed rack mount cabinet with an air conditioner mounted on the side. This could prove useful for the mining industry, as well as military applications.
For more general business and government use, they have smaller cabinets which still allow the equipment to be moved but are not designed to be operated outdoors. Some of these, such as the Campus Self-Propelled Electronic Adaptable Rack (C-S.P.E.A.R.), have there own electric motor for moving the equipment. But a standard electric pallet truck would be more practical.