Hope you have a good towing experience with the new trailer Dennis. I see what you mean now about the 320 taking up space. After the first night in the trailer, I can see that it will need to be the 310 model for us too. This model is working well for the two of us. We have used all the systems except the AC with no problems found so far.
I did watch the bedroom slide as my wife powered it out, and I did not notice any shaking or swaying, at least to my newbie eye. I'll watch it going back in as well and let you know.
Have a safe trip!
2015 Rockwood 2618VS
2016 RAM 2500 Laramie Cummins Turbo Diesel