After the ordeal of the rear curve, we got a little smarter and used a ratchet strap to pull the front curve into shape. We made a bit of a mistake here starting at the bottom of the panel, so when we got to the top, there was a tiny overlap. We wrestled that flat and used the front overhead cabinet to pull the ceiling down flat.
The rear curve actually came out pretty nice. It has a little bulge, but that only makes our tiny trailer seem that much bigger.