We carried a Honda Interceptor for me, and a Honda SilverWing scooter for Peggy.
We use the G4 Scala Rider for communication, and it works great. We tried the Autocom system first, but it just didn't cut it. The Chatterbox system we tried was pretty awful too. The Scala Rider G4 is the cat's meow. :)
The SmartTrailer was 68" by 98".
Yeah, it looks like yours sits pretty high. Ours was 22" from the ground so it was no big deal loading and unloading.
We moved to a toyhauler because I just didn't feel comfortable with the movement of the bikes, because they were mounted sideways like yours. It just seemed like they moved around too much. I had a camera mounted back there to keep an eye on things and it looked they did a lot of rockin' and rollin'. Even worse on rough roads or where the pavement was uneven.
Now, loading the bikes is about a 5 minute job with no excitement. :)
Good luck with what you decide. What bikes are you looking at?