I would also have to guess it's more a physical size limit than weight. Not to be offensive at all, but it looks like a fairly small raft, so I doubt 4 very large people would fit well in it.
Exciting that you get to ride up the belt, that's a neat touch, kind of like a roller coaster.
Kind of disappointed that it is only a 4 seater. The other family ride at TL is already a 4 seater, so we don't do it much since we're a family of 5. The one at BB holds 5 (I think it can actually hold 6), so I was hoping this one would be the same.