How do you like them? Done any offroading with them?
I think you'll be very pleased with helical LSDs like the Truetrac, especially if you plan on winter driving. They are just absolutely fantastic on the road in the winter time.
Lots of people who wheel their rigs pretty hard really like them too. Lockers are better offroad but unless you're throwing tires in the air often the Truetracs will serve you very, very well. I think you'll find that 5% is more like 1% or less given the terrain you'll see on the East Coast.