This one really isn't fair, if you don't have trucks around with anti-idle heat sources you won't know what it is.
It is our test bench for Epsar Truck Cab Heaters.
It allows Brian (Our Thermo King Dude) to bench test the heaters without tying up a truck unit. We have a loaner Espar that can be swapped into the truck if needed while we troubleshoot the bad one.
It has it's own fuel cell (donated from an old company snowblower), fuel pump, circuit board, and wiring harness. Batteries for 12 volt power.
There is an Espar Test Connector (White Box) that ties it into the laptop so that all operations can be tried and tested.
They are a very fuel efficient heat source for a parked truck.