I have recently finished building a mobile recording rig.
Having found myself in the position a couple of times where it has been more efficient to go to the artist, rather than have them come to me I have just finished building a mobile rig called "Studio B". This has many advantages, I can take my equipment and capture a band in their own environment (this has been the case where bands have wanted a "live" feel). Whilst I can easily replicate that feel in the studio, some bands have specifically wanted to record in a particular room/hall. Also it allows me to take my equipment anywhere so if I get the urge to record something it is fairly easy to do.