You are giving me hope! It looked to me as though a normal side bag that is full will not fit due to interference with the speaker and the amp on the left side. Are you using the canvas side bags in yours? I am talking about the canvas bags that come with the Ultra. My wife takes one and I take the other for our clothes when we travel. When we get to the hotel, we simply pull the bag and carry to room. We use the tourpak for things we need on the road...rain suits, jackets, helmets, etc. It works like a charm.
I have actually contempleted taking the rear speaker system off of a 12 and just getting new lids painted to match. Do you see any issues in doing this? Are there quick disconnects on the wiring for the rear speaker setup?
I thought that they would take up a lot of bag space too, but I get all my normal road trip stuff in there, plus some extra stuff in the drop portion of the bags. So I actually get more in the SESG then I did in my 2011 96" SG