I have had Iron Man, ARB, Snowmaster and others. They all seem to work. I would suggest you get the largest you need for the longest trip and power it properly. I haven't had one fail yet but have changed for more capacity. I have an ARB element now as I wanted the weatherproofing and lock. Works great.
*edit: EVERY fridge I have ever bought is still running with the next owner.
*edit: EVERY fridge I have ever bought is still running with the next owner.