I have placed some footage on You tube. It is with a landcruiser but we were accompanied by motorcycles at times. If you stick tot the main roads in central west africa, (south Gabon, Congos', Cabinda) you will be doing all the off roading you want. We had to take luggage from the motocyclist in the Cruiser because it was to much mud and pools and to heavy for a long day driving.
Look in You Tube for "crossing africa" and "Noel" and you will find 10 x 10min clips covering the whole trip from NL to RSA via west coast and back again via east coast.
cheers and bon voyage,