My mobile studio setup is pretty simple. As you can imagine, there's very little storage space in the Airstream, so I've downsized to a Taylor GS Mini 3/4 size acoustic guitar. I love it. It sounds great, plays like butter, and makes normal guitars feel huge.
I'm using an Audio-Technica AT2035 microphone through a Focusrite Scarlett 2i2 USB audio interface to record guitar and vocals, and a Korg microKEY USB keyboard for midi input. All that goes into Logic Pro X, which has far more power than I'm using, but is pretty easy to understand and work with.
That's it! I suck at mixing, so I'll hire a pro for that when I have enough tracks.
For the last decade or so I've had, "write an album of original music" on my goals list. I'd think about it and talk about it but not take any consistent action to make it happen.
This time we've made for ourselves out on the road has offered the freedom to work with inspiration when it strikes. Not surprisingly, the more I sit down to work the more inspiration I find.
Writing these songs has been a transformative experience for me. I've learned to let go of what I think I should write about or sound like, and just capture whatever happens to show up at the time. Getting myself out of the way and going where the music wants to.