Nearly two years for driving a 4WD up a hillside?* How ridiculous! I know of people who have assaulted others that have got less than that.
This guy has been victimised and smacked down because he was cheeky to officialdom. He surely has grounds for appeal against the harshness of the sentence.
* Mt Snowdon would be little more than a pimple on the landscape here. I drive over a hill almost as high every time I go to Golden Bay (Takaka Hill - 2,900 ft).
I agree that the 6 months (first offence) and 10 months (second offence) was far too harsh but then again I'm not able to comment on the time, risk and expense the mountain rescue teams had to go through to get the vehicle back down. There's also the question of trespassing and damage to the mountain railway.
The 6 months for skipping bail and associated asshattery does sound about right to me though.