Chucking or surging is one thing,
bottoming out is another... and dangerous if it lifts your rear end !!!:(
More than one user has stated the trail airs @ the 'suggested' psi have not ridden as well as when they are aired down a bit...
I too have found that to be the case on a 2012 5er and our new 2014 5er...
Actually could watch the air bags NOT deflect when above 70 psi and once dropped down to where the air bags would deflect some, it rode MUCH better..
of course, proper loading of your 5er can help that too ! good luck !
You stated you have bags on the truck ? they too can have TOO much or too little psi --- large rebounds WILL result if it's able to bottom out the suspension - check your overloads for 'shiny' spots