Sorry to hear that. Hopefully turns out okay. If it had been fiberglass and not aluminum, could have have a lot worse.
Were at a Thousand Trails last year that was quite overgrown, I backed the truck up against a large overhanging limb with the canopy lid up. The glass exploded into a million pieces. $600 for a new one. DW not happy. :( This year and for evermore, I have vowed to be more vigilant (or else).
A few years ago I was at a local dealer. The lot had a few new TTs awaiting PDI for the new owners. Some dude came screaming into the lot with an SUV and pop-up in tow. He did a fast 180 around one of the brand spanking new TTs in the center of the lot and whacked the corner of it doing some not so insignificant damage. The driver was in a state of shock. :E What a doehead. I always wondered what the dealer did - do a quickie and cheap patchup or return it to original condition?