Our newest member Ruble sent me an email asking about these amphibs. Unfortunately Ruble, if you are reading this, I couldn't reply to your email because of the digital ID that you are using so I am just replying here.
Anyway, Ruble sent me a document and link and these look very interesting. I have never seen these before. First of all, they look pretty big but the main thing that I find interesting is hydrostatic drive with a drive motor on all wheels!
No chains = no chance of "tard hand"
Check it out: Power Trac ATV - The Hunt Vee
Edit: I just started thinking "I wonder what the top speed is with the hydrostatic drive....A WHOPPING 14 MPH! And you thought your AATV was slow