We've done a lot of extended travelling with our
Ventura and I had to replace all the cranks at some point -- a couple of them twice now.
One caveat however, I don't see how to remove and replace the gearboxes without bending back the flange on the interior side of the window frame. I make a small cut just above the unit so that I only have to fold back a three-inch section.
There must be a better way, but I don't see it.