Well, not much of an update but got the shocks. I wanted to install them but couldn't because they didn't come with the air line that has the schrader valve to pump them so had to order one that will work. In the meantime, I cleaned them up so they're ready to go. I'm happy with the results!
No, that's beyond the scope of what I'm trying to accomplish, but as Bob said, newer 1500s had a compressor, (at least some models). I'm doing this on a whim, just because I happened to read an old thread about someone putting air shocks on. Thought it would be fun.