It went great.
I've done it at 2 sites now. But I bought an equipment trailer I'll be using to haul them from now on.
They would not help with any more than lifting the overturned trailer onto the upright one, they don't want to be liable for anything going wrong during a flip operation. They may not allow it at all anymore, either, I had heard there were some policy changes.
Best thing to do is call the site and ask him if you can spend an hour or two flipping it yourself, and once flipped, would they put it on top of the other one.
It took me way too long to do it (completely alone), but it went 95% according to plan. It took some minor damage to a front edge that I didn't really care about because my lowering strap was too loose. I practiced in my driveway a few days before with some trailers I already had, wrote up everything I'd need and everything I did. If you can, I'd very strongly recommend you practice first and get an idea of what can go wrong. It would suck to be at the GL lot and flip your nice trailer, turning it into a not nice trailer, then realize you'll have to find a uhaul in MD and go rent a 20' trailer or make the trip again...
Also, if you're picking up an A2/A3, or a new 1101/1102, be prepared for the brake fluid to leak when it's upside down. I've only hauled A1's upside down, but when I flipped my A2 in practice, brake fluid tried to escape from a few places.
If you PM me your email address, I'll send you my photos and writeup of the at-home practice flip.