The Expidithor - a 4x4 boat.

AeroNautiCal

Explorer
An interesting take on the self launch/self retrieve boat concept.

One yacht manufacturer has fitted their boat with pop-out tracks (similar to those fitted to a mini-excavator) mounted in the hull to self launch and retrieve.

The Gibbs/Aquada type of retractable drive/steering wheels would make for an interesting and versatile 4x4 amphibious vehicle/camper, but would be extremely expensive.
 
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