When I said remove the handlebar, I meant just undoing the stem bolts, covering it in a towel then strapping it to the top tube or mounting it to some hooks inside the trailer. Simply turning it 90 degrees probably achieves much the same thing.
Imagine what a bike mounted externally would look like after 8000 miles of this (and worse)?:
I can imagine needing a $2000 overhaul if I tried that. Riding a bike doesn't get it anywhere near as dirty by comparison. Now of course, you could use a motorcycle cover, but that's not much fun when it's covered in mud. It's also difficult to lock a bike that's well covered, and vice versa.
I did consider the mounting a rail across the A frame for the wheels to sit on, then a hefty post to mount it too. Press studs and a heavy duty cover could seal it all in, and it wouldn't be immediately obvious what's underneath.
I've got a couple of nice locks, one can lock the frame and both wheels, but they're not much use if the post you lock them to is easily cut with a hacksaw in a couple of minutes. Unfortunately, that's one of the downsides of alloy construction, it's fairly easy to cut. I could run some steel cable through the section as an anti cutting measure.
For internal storage, I'm thinking of adding channels over my chassis cross beams for the bike wheels to run in. In section the floor would look like this:
-u--u--u--u-
Since that places my wheels below the floor, I might not need any extra high over the standard 4'.
Overhead storage is a pretty good option, but only practical if you want to build a roof top clam shell arrangement that can be accessed from outside. Since the trailer will end up quite tall it might make loading a bit awkward (esp. at off road height). I did think about a double deck solution where the bike lays down on the floor, and the bed hinges up to allow access. If we fold the bar and remove the pedals, we don't need a lot of space.
Downside is that hydraulic brakes might have to be bled if transported horizontally for longer distances.
I currently use a van for bike transport and using the side door for loading is very awkward compared to rear loading. Since this is going to be a toy hauler most of the time the rear load option makes the most sense.
I think that covers all the options, but if you have more, let's hear them
