The best thing to do it not put your self in a situation where you have to buy it. I really want the truck but if I don't get a decent amount below invoice I'll wait. All dealers will tell you that there will be a markup and there may be at first but if you are patient and wait there will be...
I have BLD in my 14 rubi and to be honest it sucks. My 08 sahara was much better in the snow with LSD so I hope being able to lock the rear it will be better in the snow here in NH.
I will be running Duratracs. I have had two sets, the first had over 60K in good shape when I sold the jeep. The current set have 72K and just passed inspection in September. They are decent in the snow and are not as noisy as most other tires.