All good suggestions.
Letting air out...works great as long as you have the means to get some back in. DOH...
Other option; just loosen the outside dual.
I catch rocks in the big trucks and don't usually notice until I hit pavement (as others said). But I don't seem to have a problem feeling them in the little guys. Usually catch them fairly early, hence, usually easier to get out too. When they're really wedged, hammers don't work so well. It's still the first tool to grab though.
To respond to the question about ruts and weight on a single tire. To me, it's like a 'what if' question. They're never ending. If it was actually a problem, every truck on the road with duals would have warning stickers to not drive over a curb, as the weight of the entire 1/2 of that axle would momentarily be on that tire. But that's JMHO...