I will quote Renato Simioni post from the reiza beta forum:
"Regarding tires overheating, it is indeed supposed to be an issue. They use scrubbed road tires so not really purpose built for racing. In fact heat management of tires, brakes and engine is constant with the trucks. I recall chatting to Cristiano da Matta (who raced for Iveco in 2010) about this, and he said the truck would be at its best in the 1st lap out of the pits - all downhill from there"