I just bought a 2001 expedition and the rear seems to sit a small distance lower than the front end, which I've noticed seems to be the case with a lot of gen1 expeditions. I found a rear leveling kit online, which is just a spacer that goes under the coil spring. They have a 1" option and a 2" option. Has anyone done this and would you recommend the 1" or the 2" kit? I'm assuming that either size is a small enough lift that nothing else in the suspension would need to be altered?