This video is 10 years old but we thought it was worth sharing. The motorhome in the video is called the Terra Wind. It was developed by Cool Amphibious Manufacturers International (C.A.M.I.) which was was founded by John and Julie Giljam in 1999. It is capable of traveling at 80 mph on the highway or 7 knots on the water. The estimated price for a rig like this is a cool $1.2 million
Here are some photos from the manufacturers site.