Hurrah! Perfect for using motorbikes to extract deer.
As far as I can see from his pics and write up, all he's shown so far is he can drag one deer across a dry field he could have driven into with a pickup. And failed on another when it was wet. A pit bike in Sussex with a trailer extracting fallow - yeah, I can see that working to a point. A drag mat in the Scottish hills extracting reds with a motorbike with fat road tyres?
I guess the bottom line is that I think that that if you stalk larger deer then you need to be set up to safely and hygienically extract them. If you can't do that then you should give the ground to someone who can (or come up with a storage arrangement for a quad or share the ground with someone who can store one etc etc). There are too many folk holding too much ground they can't stalk effectively (for a variety of reasons) and this is a perfect example.
And on that note, I will step away from this thread (and SD for a bit - we seem to be in summer-silly-season with a lot of daft threads and I'm probably heading for a ban anyway).