I wish I would have taken a photo of the sign at Sky School so I could show you the wording. It was something very "PC" for sure, something along the lines of, "Guests above 250 pounds may have difficulty" or something to that effect. I shouldn't have termed it a weight LIMIT, per se. Just a suggestion.
That definitely makes more sense. And it's true; people of certain sizes will indeed have trouble with it.
I have definitely made use of the tip to pull the seatbelt out from under you before you sit down. That helps. But I sometimes still need a family member beside me to get it clamped in, especially if I have to work quickly. (Doesn't help that I always have stuff to store in the bags in front when no one else does so I am slow to start with!)
Maybe you can ask your traveling companions to help with the bags next time? Or perhaps rent a locker? If they are purchases and you are staying onsite, you can have them sent to the resort (to be picked up the following day at Bell Services), or if not, send them to the front of the park to be picked up that day on your way out.
No one else had trouble on RSR with the moulded seats? Hmm, maybe I'm wider than even I thought! Haha!....
I think DH has not been comfy, but there's nothing to be done about it. The seat in the middle might be wider, and it just has the lap belt, but we always ALWAYS ride "single rider" on RSR, and he has no choice about where he's sent.
(One case in point was that the TSM ride stopped at my own "personal" exit so that I could get out without going up and down the stairs . . . even though I specifically told them it wasn't necessary. I could do it, but I was going to be slow. Nope. They stopped anyway. Every single CM said, "It's our pleasure," or "It's not a problem ..." That was the attitude the whole way. I felt guilty for all the extra attention when it was just a little twisted knee and nothing life threatening, you know??)