Why are there so many well-kept ancient VW pick-ups on La Palma? [closed]

I've been recently on the beautiful island of La Palma, and in the rural areas, I noticed a considerable number of similarly-styled cars (same grey, all pick-ups), namely VW T2 pick-ups, which looked like this, but in even better shape:

Is there a story behind this? Are these ex-army vehicles which have been sold to farmers in lieu of better ways of disposal? Are these cars (the last of which has been manufactured in 1979) just that good for agricultural work on a volcanic island?

Picture by Robotriot (Own Work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons