Hi Greg,
We have done trips to the beautiful south a number of times in the three wheeler, and while it sounds a bit daunting to begin with, I find time passes really quickly on the road.
You will have to stop regularly to fill up, so lots of opportunities to straighten the back etc !
If you are comfortable with motorway driving in it , and I must admit on motorways I drive pretty defensively , the rest just falls into place.
The Albert Ball run is a blast by the way, and worth the miles.
Graham