While this is true, airing down to around 10-15psi(varies depending on tire size, AT vs MT) will give you a better overall ride when off pavement.
I agree 100%.
Honestly, we have a lot of dirt roads that we travel on. Some of them are really washboard like. I don't think i have gone in anybody's truck that was smooth with full tire pressure.
Usually when we take the toyotas out we are aired down pretty low anyways 8-12psi (of course that changes too, lower for snow, etc..) That is the only thing i have ever done to help the ride quality out offroad.
Just weigh your choices.. obviously im not gonna hop out of the truck and air down the tires just for a small patch of bumpy road if the rest of the drive will be smooth or on pavement, but generally if i know im going to be offroad all day then there is no questions asked, my tires will be ~10psi or less.