While I was home on leave I test drove a LB7 dually from the DTS shop with one of the upgraded turbos on it and that thing will bring the mail to say the least. It spooled a good bit faster than my billet 4094 on my LMM. It was stock fuel all the way around, with good response and felt like all the power you would need. It was setup as a tow rig for hauling trucks to the track, and it has done well for them so I think your towing concerns would be answered with one of their turbos. David and DTS produce some good products, solid guy and will shoot you straight.