I m 6'3 and 365lbs. No issues on any rides at Disney World. They're the most accommodating. Also use the bucket seat on Tron.
6'5” 350. The lap bar on Seven Dwarfs was a close call for me. Legs squeezed real tight to make that work. Otherwise no issues. But I haven't gone on some of the rides with the super customized ride vehicles though
5'11", 300. I carry a lot of my weight in my hips and while I do fit on Seven Dwarfs Mine Train, I find it uncomfortable enough that I skip it unless I'm visiting with someone who hasn't ridden it before.
Looks like 300 lbs is the minimum weight on this subreddit. 
I know this isn't what you asked but as a fellow struggler and whose weight fluctuates, I approach Disney differently depending on my weight. My tips: If you plan on wearing shorts, get anti chafing rub or wear bike shorts underneath. The chub rub is stronger in Disney as you are more active than your typical normal day. If you can, pack a peppermint foot cream to put on your feet at night to help soothe your feet. Enjoy the shows (The Tiki room, carousel of progress, The Lion King, Beauty and the Beast etc). It will give you a chance to get off your feet, sit and rest while being entertained.
I second this. Treat it like an athletic event, because it is! Wear great supportive shoes (I recommend Hoka sneakers; Oofos recovery sandals for afterward.) Wear good socks (I love Bombas.) Put anti-chafing cream on your thighs, arms, and on your feet. Drink water. Consider taking something like Liquid IV with you to add to drinking water in the parks. The amount of walking is, well it's a lot, but it is manageable. Just make some deliberate decisions to keep yourself as comfortable as possible.
It's totally normal to have to powder your fat disgusting thighs and also walking around a theme park is an athletic event. 
300 pounds isn't too extreme in terms of the average American. You might have trouble fitting on TRON and Seven Dwarves might be a little tight but that's about it. Nothing at Disney is SO intense or crazy that requires strict ride restrictions. Universal can be different but if you're focused on Disney you'll be fine.
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I went to disney world a while ago and there was this fat woman on one of those mobility scooters, and she had a chonker kid who was crawling on the floor beside her instead of walking because the poor kids legs couldn't support his fatty frame. That shit is child abuse, frick fat people
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