I have the ome lift not the franken lift but it uses the same rear springs, I have the HD's back there and mediums up front, ride is awsome. Much, much better than stock. I would not get the hd's up front unless you were going to get a bumper, I might even get the Light duty fronts since the franken lift sits alittle high in the front any way.
Ive yet to tow with it yet, i dont tow 3k though. With the stock setup it did great with our little 2500lb boat, no sagging at all. I just went out and weighed the tongue weight and its 230lbs!! I never thought it was that much, I always figured around 150 or so, i guess its b/c the wheels are so far back on the trailer, this is only a 15ft boat.

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster