How useful is the rear Elocker in real world conditions? I know it is very useful in hard core off road conditions, rock climbing, deep mud etc. How useful is it in snow? Does anyone find it useless? Has anyone kept from getting stuck because of it? Is there anyone that has it that regrets gettingit. Do you think the OR and Pro 4X packages are worth the extra cost and decreased fuel mileage (due to the gearing) vs just a plain 4x4? I am referring to the functional added off road value that the gear ratio, Rancho shocks, BFG Rugged Trail tires, E locker, skid plates etc. offer. Not considering the looks of the packages, stickers, guages, leather, rims etc.