G'Day Reelcrazy,
I've got a mad yank mate who has a 21 foot walk around. It's an older one (1991 I think) and I'm not sure of the model but it seems to stand up pretty well. He does a fair bit of bay and offshore stuff with it. He brought it over here when he married and Aussie girl and immigrated. If you have any more specific questions I'd be happy to get some feedback from him.
Cheers,
Smerl