I will try and answer your questions one at a time! The AC breaker we had was a totally outdated screw in type fuse box, so it had to go. It was on the far side of the trailer from both the shore power cord and the 7 pin 12V
wiring. We rewired everything to be on the same side of the trailer (pretty easy to eliminate the old fuse box) and brought both the AC/DC connections to the same point. where they really entered the trailer anyway. We were then able to bring the solar connections down to this point as well by running them through the roof and down inside the wall. This brought everything together at one point and made the it possible to install the Iota box for all systems. Everything is wired here, the inverter, converter, AC/DC and solar.
All you have to do to get rid of the AC panel in the rear is take it out and hard wire the connections back together. You will then split your circuits as needed back up front, as there is probably at least two AC circuits already existing. You just need to know where they go.
While we installed a full size queen bed instead of a gaucho, the effect is the same and you can see in the picture both the Iota unit and our solar controller in a very clean installation under the bed.
I would highly recommend that you use the Iota for everything. It will clean things up tremendously! If you need more pics, I have em'!