Not sure i'd put one in the rear of a DD. but thats just my preference. Lots of people do.
As for the install, should be pretty easy. check www.rockcrawler.com
and check the tech section. theres a few articles on installing lunchbox lockers. i beleive they deal with the powertrax no slip, but all lunchbox loxkers are basically the same.
92 YJ. High Output 4.0L
Rubicon Express 4" Lift Kit, 2" Body Lift,15x8" AR 767s, 35x12.50 Xterrains, Home Made Snorkel, Sanden OBA, Home made rocker gaurds. 8.8 Rear with Discs, 4.10s F&R, ARB rear, Detroit EZ Locker front, WarnM8000 with Viking Synthetic Line, Beadlocks, Tons of Mods
Score: 682RRv1.0 with a BOA of 13.47
I'm now doing custom bumpers and lift installs in So-cal