I say either do it yourself with help from Mike at Inglewood Trans or have a reputable builder built it for you. I am not a big fan of ATS, "To big to fail" Ya right. They flaunt their warranty which is great but if you have to use it alot then well I would rather not have warranty and not have mess with it. I built mine with phone tech and it has held up great with around 450 or so to the ground. Have only towed 12k- 15k so far but did that with a solid 100 horse tune, no problems.
Mike
1995 Suburban K2500 6.5TD 3.73's Innercooled, Updated cooling, Banks 3" exhaust no gizzards in the kittie. Pyro/Boost/Trans temp. Transgo HD valvebody kit.
2002 2500HD, CC, LB, 4X4,California Truck, Federal Emissions Front pipe, Plugged recirculator, modified air box(Per Kennedy's page) 6" RCD lift, 35" tires.