EG,
You are not going to get much response on this as very few dualie owners air down their tires at all. I don't currently own a dualie, but have some experience with airing them down. The myth is that it's a no-no to let the tire's sidewalls touch while rolling down the beach. The truth is you don't want them to touch and get hot through abrassion. If you go slowly enough to get no heat build up and not too far at a time, you can take the pressure down to say 30 pounds without undue damage to the tires and still have enough floatation to make it work. The woe is actually lowering the pressure on six tires, two of which are hidden and hard to get to. I've done this and really don't think it's worth it, it's just so far to go for a few hundred feet of sand. But if are going to say, Pismo Beach for a week, or the Yuma Dunes you don't have to move much so it will be worth it.
jefe
