I've been to Havasu and image to agree. It gets beastly hot there.
But there are some simple things you can to to help the system cool better.
The simplest and cheapest is the ' Muddypaws Mod'. Search for it on this forum. It will 'fool' the refrigerator into 'thinking' it needs more cooling. Itmonly works on refers wiere the thermistor clips directly onto the fins. This is the only thing I've done to mine and it runs VERY cold, -18 in the freezer and and in the low 30's in the refer. But I don't live where it gets up to 104 every day for weeks on end.
Check out www.snipthetip.com
for an adjustable thermistor.
3 or 4 computer fans mounted above the refer forcing air out the upper vent has been very successful for lots of people. Might cost you 30-40 bucks and some elbow grease. Some very good ideas and pictures can be found on this forum.
A battery operated fan blowing on the fins might help. You can find a disk drive cooler modified to clip onto the fins on eBay for under $20. Also helps with frost buildup.
Good luck & Happy Camping!
Does Havasu still have that old bowling alley downtown? The one with the lanes about 60% of regulation length? I bowled good there!