I've travelled several thousand km on all types of dirt roads and have never had a problem.

I think someone has an empeg in Alice Springs. I'm sure it will be getting it's fair share of dirt roads.

I've found a fan to be worthwhile, reducing operating temps from the fifties down to the thirties. I used a 486 fan with a series resistor dropping the voltage to 8-9 volts to keep the noise to a minimum.

Rod.