Carl,
Yes, it is an inflatable screen, 40 feet wide when open. The inflatable screens make it possible for us (myself and my business partner) to run up to 4 events in a week with just the two of us. We also have a 24 foot wide screen for the venues that we can't fit the large one.
We run events in stereo with line arrays from QSC. We went with QSC since they have a cinema group and their live sound guys are great! Don't know if you have been to CinemaCon but QSC does a great job of turning Caesar's Palace Colosseum into a surround sound screening space. We designed our system (power distribution, audio distribution, and so on) to scale easily to surround sound when we choose to do so.
Right now we mostly deal with released films, so we use consumer media (Blu-Ray, DVD, even VHS once, sadly) and yes, we always check that our clients license the screenings. We have also used cable boxes for live broadcast events (football games and such). The projector we use is a Christie L2K1500 15,000 lumens with a 2k resolution. I wish it had better black definition but truthfully most people don't notice, and we typically don't have control of ambient light at most of our venues anyway.
On to PT's:
We did get a PT 1430 and have used it twice now. The first place we used it had a gentle slope, but the the unit carried all our gear nicely despite that we had no clue how to use it efficiently. It was actually quite funny: I think it took us twice as long to set up and take down because we had no idea how best to use the PT especially since none of our gear is palletized yet. The second location we used it at was mostly paved but access to the screening location was too tight to fit our 26 foot truck through. We moved in all but our line arrays using the PT. We were also able to easily tow a generator into the site.
So far I have mounted attachment plates to our speaker stands, installed two 40 watt led lights on the ROPS (similar to SpringHollow), and lastly, attached a beacon and fire extinguisher like what's installed on the 1850s.