The Expidition is a vehicle I regularly see towing large Airstreams, it is capable.
I'm biased to the Airstream, they are made to move. I've come up with a way to store two bicycles inside the trailer while towing and will not get in your way when parked if you are OK with having them in a simple (clean) bicycle bag with the wheels off. We have a 25' Flying Cloud and I *think that many of the smaller versions are the same interior width. Basically, you bag the bike and lay it down on one of the couches! Done. It is not in our way.
I'm no fan of carrying anything off the frame of the trailer, they are not made for that.
Lemme know if you need any help. At this point in the game I'm conversant in broke trailer stuff ;)
BTW Brilliant thinking, you are going to love the community and lifestyle it brings.