Blackfoot,
You are correct: the 300's pontoons are 18" x 76", the 400's are 18" x 84", and the 500's are 28" x 84". Due most likely to the increases in weights.
Bill's rep is the main reason why I am considering purchasing a cat I cannot see. Have to wait until monday with our "phone tag" game. Sno Trans is closed all weekend.
I was told once, the 4 cylinder had exhaust on the drivers side, 6 cylinder on the passenger. No duals, so? Possible has a differant engine or maybe some one just liked the "more balanced look"?