Xcelerator might be an issue for bigger people. When I was around 270 pounds I could barely fit on it, but now that I'm 215 it's absolutely no problem.
La Revolucion' also may be a problem, but that's mostly for people with broad shoulders.
Other than that, shouldn't be a problem. Silver Bullet does have a "Big Boy" seat.
Also, Xcelerator, Silver Bullet and Pony Express have "Test seats" that you can try prior to riding.
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All the rides were fine except for perilous plunge. Although it did offer seats with a larger belt restraint. Unfortunately even the larger belt restraint was too small for some and several had to be pulled from the ride. I was fortunate enough to just be ok on that one.