Depends on your fueling and how much power you want to have. I'm just saying the HTB2 would support towing, it spools fast enough. My "Killer B2" (64mm compressor rather than standard 62mm) I feel will support 400 hp safely at my altitude. Maybe not quite as much at 6000 feet, I'm pretty low. Also, your truck with injectors will run cooler than mine with stock injectors and a lot of duration. 3g's run hot.
-Scott
-Scott