The right-side power sliding door on my '05 caravan stop in the
middle of the track whether opening or closing under power. I cannot
see anything impeding the movment, nothing wrong with the plastic
'belt' that seems to be what motivates the door (can't see anything
else that would) and I can't feel any 'hitch' or blockage in the
movement if I move it manually. If I manually move the door past this
point, it can be made to continue under power.

     Any  ideas what would be causing this or what to do about it?

     Also, after having 3 independant shops look at the alignment and
2 dealerships, nobody can tell me why this car develops a continual
pull to the left. Any ideas here?

Don