It is the Horsetruck belonging to Karina Mihaka:

Red Hino, Registration plate TX 3296.

I understand that Timatanga Blue, Timatanga Argentine, & Karina (along with a couple of pit bulls), are doing the rounds of the Christchurch Showjumping circuit right about now.

Goodness me, it must truly be frightening to GNK, Mike, and Karina just how many pairs of eyes I now have on them.

Update 17/2/12:

This will do nicely – thank you, team:

Doc1