Originally Posted by old40ford
That would be a YES
I am presuming that you mean an airbag at the pin box, right? I have a Trailair and have towed with it inflated and deflated (they do go flat after a while). With the (tiny tyre-like) airbag inflated to its correct height (it is inflated and measured according to a mark on the device, not according to air pressure) The ride in the truck is measurably improved. When I run with it flat, I feel every bump from the 5'er, with it inflated, these are smoothed out. It also reduces the amount of shock and bump on the trailer contents. Worth every penny.
Airbags on the axles of the trailer, never seen a good word (from experts).