The Detroit TrueTrac IMO is the best limited slip on the market. The TrueTrac is simple to maintain, unlike regular clutch type limited slips, it requires NO friction additives to the gear oil. Additionally, in the snow and ice it behaves similarly to an open diff, without the quirks of a clutch based limited slip. On the road, there isn't any erratic behavior or slop while shifting lanes or accelerating in a turn from a stop.
The TrueTrac operates and mirrors the Torsen type limited slip used in the H1 Hummers.
Small rocks and tires < 33" are within the operating specs of the TrueTrac...
I am very satisfied with my F&R TrueTracs and I didn't have any issues with the trail I was on depicted below.