Yes, sliding window on the windoors. I was also concerned about the cap causing it to look saggy in the rear, but could hardly notice it with it installed. We have loaded the bed a couple times and still haven't noticed much droop.
I did purchase the airlift bags for it before the top came in...
That's a good question and depends who you ask I guess. I spec'ed out and HD version but couldn't get the windoors with that option and possibly not the frameless glass. I was told the standard version had a 400 lb rating but can't find it listed anywhere, I'm sure for liability issues. I agree...
2979.00 was where mine was priced at, and I believe I added almost all available options. Sportsman windoor, led lights, fold down front sliding window and the frameless rear glass that unlocks with remote. Very happy with it. I added some rhino rack bars afterwards