that'd be an issue in boats too when they're on the heel underwayDizzle buy something else I done some research on them, they have limitations for off road and on road use that may be fine for some but not others. The downloads specs for 22, 36, 50, 60ltr models say sit for 6hr after unpacking before use that's ok. The big one is not to be run for long periods of time as the tilt angle must be less than 5 deg so to me that means 4 deg is it and it dosen't take much of a hill to reach that. So it may play up in hilly areas in the bush on the beach even around your town or city or at home in the driveway if it's not level or at work depending where you park. You have to watch how you park overnight or maybe if going for a hike or swim or fishing say at the beach.
They mention keep away from wet and humid places so no good on the ute tray and no good in the tropics. They need a 200mm clearance at the rear, 100mm on the side which is more thn most need.
They have a lot more fridges even uprights for vans I didn't notice downloads specs for them so do your research before buying. When I bought my first 12v compressor fridge 15yrs ago it was good to run up to 30 deg and other people have had their fridge for twice that and more so Brass Monkey are way behind the 8 ball. Hope this helps with peoples choice on what fridge they buy as these would not suit me at all.