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It also would depend on height, and how your carry your weight. But between 300 and 275 is likely when some rides will open up for you, but it REALLY is going to come down to how you carry it. So, I'm just going to give you some general advice as a plus size guy who can just about get on everything, but it's an effort to do so.
If you can wear a 48 inch or less pair of pants is what I would say for Millennium. Because the limiting factor there is getting the belt around you. If you carry your weight in your gut, put the belt around you and under it, pulling as you sit down, that makes it much easier to pull it tight than trying to do it once seated. It's the least accommodating on your list, but not the least in the park (That goes to Cedar Creek Mine Ride, crazy enough)
TT2 is PRETTY accommodating, the most out of this bunch in my experience. In the running with Maverick for the most accommodating of the big rides. When you sit down, grab the lap bar by the red bits on either side of you, scoot all the way back, and then push yourself up. That'll put all your weight on the lap bar and give you the best chance of getting the green light.
Steel Vengeance is a lot about the size of your thighs and hips. If you carry your weight higher up, it'll be easier to get on than if you carry your weight low down. If you carry your weight in your belly, it's about getting it away from the bar.
Gatekeeper is a bit trickier to give advice about, but I will tell you that if you are close on the test seat, TRY. The test seat doesn't ratchet down, but the actual seats do. And that makes it SIGNIFICANTLY easier for a ride host to get the belt to buckle.
Demon Drop 2004
Castaway Bay Lifeguard 04-05