Stay on top of your oil changes and be anal about fuel. Nothing kills the modern engines quicker than a bit of dodgy fuel and due to the way the fuel systems are set up the repair costs can be somewhat scary. If you ever do end up touring in out of the way places a secondary fuel filter/water seperator is a good idea. Some guys even go as far as running the fuel they buy in town through a filtering funnel arrangement. Personally I don't bother but I do always fill at the same servo. Look into Holden's position on biodiesel and be aware that some of the smaller chains do contain up to 20% biodiesel. I did run it in my Navara with no issues but haven't with my cruiser.
The other thing to consider is fuel additives. There is much debate around the requirements for something to control diesel bug. Personally I've never had a problem in 20 years of driving diesels but I am sure others may chime in with different experiences. The other thing that is often brought up with additives is lubrication. Apparently since low sulpher diesel was introduced it now has much less of a lubricating effect for fuel system components. There have been many debates over the best way around this - some of the additives supposedly address this, I personally add a mineral 2 stroke oil at a ratio of 200:1 and some say nothing is required. All I can say is that the engines I have added it too did seem to run quieter so I am contiuing with the practice. Do yyour own research on this and make up your own mind though.
The other things to research are a catch can and the egr system specific to your vehicle. I am not sure if there is a Colorado forum but this will be a good place to start.