Norm you mention portability is a major factor. I wonder if Peter will do anything different for yours than he did for mine.
Mine is built like a tank and almost as heavy! The mirror cell frame mount is actually made from solid steel bar. The mirror box is a heavy beast to lift and move single handedly without the mirror in it!
To load or unload to the back of a vehicle requires either a ramp or a helper to lift it. Doing it alone just isn't possible but with two people its not hard.
As i wanted to be able to move and set it up alone I got myself a small trailer and made a ramp and fitted it out. Having gone to that extent I wonder if in hindsight I should have gone for an 18"