You can see how my ARGOSY was stripped, then painted, on my main thread here:
Stripping is shown around post #77, earlier in the thread.
We used Aircraft Stripper, in a technique described above. Then you wash and rinse well, followed by an acid bath to etch the aluminum before the prime and paint. The acid bath should be done carefully and quickly and rinsed very well.
There is at least one well respected voice on these forums who cautions against using the acid bath; he says it damages the rivets.
There is always lots of advise here and you have to sort through things and make your own judgement about things.
I choose to ignore this concern because my friends in Ontario have been building, repairing and painting aluminum truck bodies this way for over 60 years with perfect results. Also, logically, AIRCRAFT STRIPPER is for aircraft, and Airstream claims to build trailers in a similar manner to airplanes.
My paint job, several years later, still looks like it just came out of the paint shop: