I have only gone been to BB and I can speak from experience that if there is a weight limit it is a big one. lol
I am 350lbs and my wife is also pooh sized. The two of us plus our two kids were able to go on the Raft as one family with out so much as a bit of hesitation.
The one thing we did find out is the heavier you are the faster you go down these slides which made for some fun.