2 air ride tractors with pancake type bags have been here for 10 years, one with rollie-uppie bags has been here for about 5, all have unloaded countless loads of grain with suspension charged without any damage.  Lowboy gets a 35000 lb tractor or dozer driven off the back with bags aired up...hasn't hurt it any either. 

The suspension better be able to handle having a wheel lifted off the ground without breaking anything, because it is going to happen at some point in time.   

This is an old wives tale if I've ever seen one.