Contributors are confusing two totally different vehicles which were both called the "Otter."
WWII Canadian Otter made by General Motors was a 4-WHEELED tall armoured reconnnaissance car with a turret for a Bren gun on top. Very rare. The ex-Bill Gregg one is at the Royal Canadian Artillery Museum in Canadian Forces Base Shilo, Manitoba. The Canadian War Museum has one on displaay. One or two were in private collections in Canada. At least one is restored and running around UK as far as I know.
The US post-WWII Otter was TRACKED, and made by Pontiac. A collector had a couple of these in the Vancouver, BC, Canada area but I have not seen them for a few years.