Welcome Mickte to 4x4 Earth. I haven't done the cape but friends have. There is many places to fill up on the way up but you will need to carry cash. It is aways handly to carry addition fuel but is that worth installing a addition tank is up to you. Recommend getting the Hemp and RAQC maps of the region. ARB and TJM have some good books that will help and generally give some good places to see that are just off the main road. 4wd Action has some DVD's of the trip also.