Hi Jacques
I believe that every person has different needs.. so one persons list will not always suit another persons needs.. but there is a few basic things you can pack my list is as follows:
Meat,Fire wood,blits,booze,Tab (mix),Smokes,Glass,Portable braai,toilet paper The rest can stay home....
here is the basics i pack:
1. Tent,matras,sleeping bag,pillow
2. pre marked Maps (just incase the gps bombs out) and Gps
3. Medical aid kit ( I use a basic 4x4 med kit that i added some stuff to like sting-go's, and some antihistamin (hope i spelled ---that right) tablets, and anti goga ( tabart or pieceful sleep works best)
4. Toiletpaper
5. Spade
6. clothes and toiletries( but not much mostly basics like: clean undies, long jarmy pants, shorts and a few t shirts maybe a ---jacket and a good pair of hiking boots)
7. Chairs
8. foldup table
9. cutlery (1x melinine set = 4x plates,cups,bowls,knives,forks,spoons ens.) tongs, braaigrid
10. food ie: 2minute noodles,meat, frozen mix veg,and some hardy fresh veg like patatoes or sweet patatoes also found that ---werda pre made salads works wel and some premix potbread or dumpling mix u buy at outdoor warehouse
11. fridge and gasstove
12. torches ( yes more than 1 cause sometimes i misplace them)
13. Drinking water (i have an 50l plastic tank that i use)
14. sweetstuff (this includes some mix a drink for the kids, some droewors or biltong ens.)
15. feul ( i take my km/l and calculate the distance i need to travel between feulstops to work out how much feul i need to ---carry extra
16. Gasbottle
17. wood ( i normally only buy this at the last town i get before im "in the bush")
18. Black Bags
Spares wise:
1. fanbelt
2. Q20 and silicone spray
3. cable ties (big and medium sizes)
4. heavy duty ducktape
5. hoseclamps (varios sizes)
6. piece of offcut radiator hose and feul line
7. 5l bottle of enjin oil
8. varios sizes bolt n nuts
9. spare fuses
10. tools ( multi select screwdriver,socket set, a few relavently sized spanners)
Recovery wise
1. spare wheel or 2
2. good tyre repair kit
3. tyre pump
4. high lift jack
5. snatch and/or kinetic rope
6. 4x shackles
7. gloves
As for border crossing and documents.. that all depends on where you want to go, but the basics are:
1. valid passport ( some counties your passport must still be valid for 6 mnths after your return date)
2. certified copy of your cars registration ( and a letter from your bank giving you permision to take the car outside of SA if your car is financed)
3. proof of insurance for outside SA borders
4. you have to pay road taxes at the border of the country you go to
5. you have to have a ZA sticker on your car, and depending on their laws refecters aswel (just buy a whole lot here and drag it with, as they will sell you sum but at rediculles prices
there is more, but i cant think of it now
Hope this helps
, even my toilet paper consumption goes on a spreadsheet..... 
