Not to pull anyone's chain, but I seriously doubt if the inside wheel came off the ground anywhere near 2 ft! It lifts maybe 3 inches, and you still have three wheels on the ground with your voyager kit.
I have ridden a lot of miles on the voyager, and have followed a friends voyager for the past two years. The inside wheel will lift a little bit, but I doubt if you could turn it over on purpose. We ride with two wheelers and other makes of trike conversions all the time, and twisties or left/right corners are no problem whatsoever. The outrigger wheels are designed to not have hardly any down pressure when going straight, so there is almost no pressure designed to keep them on the ground when the bike leans a bit.
If you will quit worrying about the rear of the trike, and only concern yourself with what's in front of the trike, you will get comfortable with it and never even think about it. That is until some novice following notices it and starts talking about it again.
Talk to voyager about your concerns. They have sold thousands all over the U.S. and other countries. Have you ever seen a story about one ever tipping over?
I'm sorry. When I read the first thread, somehow I got the idea you were talking about a voyager kit. Just paint me old and stupid. I understand you concern a little more now that I reread the entire thread.