I was flipping through this months issue of Boating World and came across an article describing islandboat.com
They make pontoon boats that expand when on the water and retract when putting it on the trailer and storing it.

Here are a couple pics.

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It comes in 2 models, an 18ft and 22ft model. The 18ft won an innovation award at the 2014 Miami boat show.
I think the idea is ingenious!
I would think, in a few years, we are going to see more pontoons doing this type of thing.

What do you guys think?
Would you buy one?
Aside from malfunction, what would be a few negatives to this?

Here is their website:
http://islandboats.com/index.html