I have a 1993 HR 1000 built on the Ford chassis. I have not had overheating issues even pulling a Jeep Cherokee in the mountains. I have also not noticed too much heat radiating from the dog house into the cab. HR placed a fair amount of insulation on the dog house. Most of the problems with plug wires melting can usually be traced to missing heat shields on the exhaust manifolds or exhaust leaks at the manifold. I just ordered the Banks power pack system since I have two broken manifold bolts with the accompanying exhaust leaks. I should be able to put them on at the end of this month.
Mike
