I would guess you will need to do a dealer fix on it, if you want it to be done right. I don't know which rig it is you bent, but if it is the 2014 the step system is like mine and probably is not too expensive to replace. I think it is a relatively standard step system, not special to Airstream. If you didn't bend the supports it may not be hard to replace or terribly expensive. Possibly you could do it yourself, not sure of the support damage.
Now, if it were a classic step system from older Airstreams, or the "classic" series of new ones, it would be very costly and difficult to repair. That is an Airstream exclusive step system.
Fix it right, it is a resale item for sure.