My dimensions are 48x24x16 and with the trigger 30(30x12x15) I wish it was a little wider. You can definitely get by with a 20, no problem though. I copied Jolts approach with an ATS(Imitation is the best form of flattery Jim!) and it feels a little cramped with everything in there. Do you plan to put a lot of equipment on it or run a fugue? If so, It might be worth going with the 30 long. I would have gone with it from the get-go if I wasn’t trying cram the ATO setup under the stand too. If you don’t plan on putting a lot in it - the standard 20 is simple, and you could pull it out/move it around easily. Sent from my iPhone using Tapatalk