I installed the larger rudder on my PA-14 exactly one year ago today.....if you trim the larger rudder to "fit and not touch the ground" when tilted up on the end, you now will have a duplicate of the original rudder.

I carry my PA on a Hobie Trailex trailer, modified with 2 7/8" OD schedule 40 PVC parallel pipes and I have no issues launching or recovering with the larger rudder....just make sure it's retracted all the way up.
Once on the trailer, I let the rudder hang down so the internal rudder hardware has all the tension removed.