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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A guy I worked with years ago went to Disney World for his honeymoon. He said he'd never seen more scooters in his life. Most users were between 20 - 40 years old and all morbidly obese. He saw some fatty and his wife get in a fight with the ride operator because they were too fat to ride in the same log on splash mountain lmao.
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I went to Knoebels and one bobsled ride had extensive warnings that every rider was going to be weighed with a scale on the platform, and only the operator would see the weight to decide how to balance you along the cars. I think every ride should have a scale.
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Mobility scooters can be a godsend for people with serious health conditions, but they are absolutely also the final nail in the coffin for fats. Once a
get the scooter, it's over. It completely removes the last traces of movement from their lives and the floodgates are opened for complete sloth. For all they've helped people with serious arthritis or whatnot, they've been a disaster for the obesity epidemic. 
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