So recently I was trying to haul my wifes '03 Volkswagen Beetle with my '08 Silverado. The truck was pulling fine, plenty of power, no struggle as expected. Around the 100 mile mark my truck began overheating rather quickly, quickly hitting the red zone, I pulled on the side waiting about 30 minutes for it to cool, until I could get somewhere to unload her car. After unloading and just hauling the trailer there were no overheating issues, everything seemed fine. I also had a recent issue with hauling a couple hundred pounds of dirt, I could tell it was starting to get warm under the hood. My thought is probably a clogged radiator, but I'm curious if anyone might have alternative suggestions to what it could be, and maybe any specific things I can do to help prevent this down the road after clearing the radiator and possibly adding another/bigger cooling system.