Cool good to know, I'll definitely need to do more AC research it appears, I'll be trying to avoid adding much height to the roof, as it's already like 11 and a half feet tall, but I suppose if I could find a roof one that's low profile that could work
consider outside the box.
Maybe instead skip or supplement traditional; but under sized, Aircon in the cab. Cab is a solar oven which makes it a bit crazy to consider conditioning the interior of an oven. Use your vents to push hot air out..... and mostly just change climate of immediate space around the pilot(s)
. 12v or 24v compressor type cooler-with bottle of coolant inside
. create poncho(s) or similar with a hoody- sew/glue? fine s tubes thru this including hoody. (plenty Utube videos on how to make race shirts/cooling systems to spawn ideas) Connect to small water/coolant pump. Cool all Pilot's small environment directly around them, instead of whole cab. Be unique.?? Get a vintage looking fighter pilots cap.... or even military helmet and run cooling into that instead of hoody??
... suggest poncho style, or half a poncho??... so you can slip out from under it to get in and out of truck. Myself, am thinking just putting it on my seat belt so it moves out of way when seat belt detracts. One could even experiment with running tubes through part of your seat cover to get backside. Heck you can even make a full suite (like race car drivers, Astronauts and EOD staff* use) and enough hose to keep yourself cool in desert heat while your outside changing a tire if you want.
. add a solar powered exhaust system for summer use to just keep heat sucked out thru out the day so when you jump in it is not already so hot. Air inlet on floor to access cooler air from below truck. Maybe an RV sewer valve to shut it for water crossings? Mention this because huge reason why Vehicle Aircon. is so HUGE BTU's is to cool a solar oven baked interior extremely fast. Always vented .... reduces this issue.
*Have got two decommissioned EOD cool suits for this option to experiment with now; along with a portable coolant heater as well as portable coolant chiller. Suites were cheap on ebay. Search Med Eng. Will experiment mostly for heating myself, along with electrically heated gloves and socks. Thinking these will open more options in winter with my Reynard's syndrome issues. When below 50f finger/toes go numbish-stingish. Hard to get anything done like that.