I've installed a pair of these in a restaurant we used to own. Pretty straight-forward, save for the refrigerant lines, had to call in our HVAC guy. Our Saurer 6dm cabin is 15.5x6.5 in size, and we thought mounting a 32 inch wide evaporator on the front bulkhead would be too intrusive. That section is new, as we added 27" of interior space to the existing aluminum Swiss cargo box. We have a Splendide washer/dryer on one side, and a Thetford cassette toilet on the other, so, an evap unit on the wall would have been a head-banger~! We opted for a Rollicool unit, 7.53 seer rating, not efficient, but, portable. Our big batteries and the solar do just fine with it. 479 bucks on Amazon, and not very good reviews. So far, keeps our cabin nice and cool. Just not sure for how long~! Here's a couple pics of our test-stage setup.