That does look like a great trailer, but the current price is over half of what I paid for my Quad ($7500), and 8 times more than I paid for my 3 wheeler, and snowmobile (@$500).
I've never used a trailer to get a deer out, just drag them behind the machine. Tho there was one that I had to put on the back rack of the quad to get threw a bog, but would never have gotten a trailer threw there anyway.