The computer I have used for this is a fairly standard PC compatible machine, the unusual thing is that it has a lot of drive space for it's vintage (although nothing spectacular for modern day capacities). There is really no fancy hardware in the box.

My initial concerns for overheating the CPU and drives have proven unfounded, the processor doesn't even have a fan on it, and only a tiny heatsink. My theory for this is that although the body work of the car gets hot, the heat is kept in a small layer against it, there is no radiant heat getting in the trunk as there are no windows. I haven't measured with a therm, but experience says it is not a problem.