[VAC] Re:

[Inlandrv@xxxxxxx]

Ken. Generally speaking, any Airstream trailer or motorhome that has been acid washed, is a never ending water leaker.
The acid gets under the rivet heads and usually not rinsed properly. For that matter, a steam cleaner does not do a good job of rinsing. The net results, "over time", is the acid will repeatedly reactivate and will continue to eat away at the aluminum, "underneath" the rivet heads. 
Purchasing such a unit, with my past 36 years experience of observation, would be 
risking, "will it or will it not" have future water leaks. The usual answer, is "yes."
 Andy