I have been away for awhile. I tow 12k-13K behind the truck. If I didn't have 3. 54 gears 285/75r16 tires I would have zero issues. 5th gear I can do anything I want. It is only in 6th gear below 2000. Below 2000 in 6th as long as the road is flat egt is about 1150, once I hit a hill it climbs to about 1300 or so. Nothing alarming, but I am sure if I were to climb a long run like this I could see some issues. This charger moves plenty of air, once it is above 2000 in 6th I can hold it to the floor as long as I want and the egt's are back around 1150, and the MPH can approach 90. I have sold the charger off of the truck since I was deciding to trade it in. I have talked to paul at HTT about a custom charger. Last time I talked he said he could do it.