Unfortunately, we don't have any solid data on Whipple-equipped trucks and towing fairly heavy. It's possible that the extra power generated by the supercharger may keep your overall RPMs lower when pulling and won't cause excessive downshifting, thus mitigating heat generation to begin with. However, it's far more likely that since these trucks tend to have heat problems when towing in general, that the supercharger will likely not help. You may want to look into Mishimoto's All-Aluminum Radiator if you're concerned about heat.