The last time I went, I lowered pressure down to about 8psi. yeah, and that was with stock SR/As before I lifted.
I disagree with the advice to avoid 4-low, but for different reasons. 4-low isn't just for rock-crawling, it's for any situation where you will be moving at a slow speed (under 20 or so) for a long time. It's better for the engine and transmission to be going at the right speed, you don't want to be at a low idle the whole time, your ****** will overheat, and you don't have much speed control. Try it sometime, pick a number between 1 and 15mph or so, and try to stay at exactly that speed. The jeep will not be happy with you. In 4-low, though, it's a piece of cake. I put my jeep in 4low in 1st gear, and it's much slower than idle in 4hi/2wd. I can actually get up into 3rd or 4th gear before hitting 15mph, which is good, because you're not as limited by what speed you can go.
As far as 2wd vs 4wd, if you have 4wd, why not use it. Momentum is definitely key, and so long as you keep moving you're fine, but with 2wd, you really only have ONE wheel pushing you. If that wheel happens to hit a soft spot, your momentum could disappear fast. 4wd you'd have 2 driving wheels, so it's going to be more likely to keep your momentum going.
My advice is, if you are stock height, REMOVE YOUR SKIDPLATES. There's nothing on a beach that you'll hit, but those plates drag and get you stuck all over the place.
