In 2010 I planned and did the same trip as you are u proposing, I used a Landrover as I wanted not to use campsites and do my own thing with wild bush camping. The idea was down west in 2010 and up east coast in 2011. Its 2016 and I am still in Africa and currently in Kenya moving to Uganda in 2 weeks and soon to be turning south again to be in malawi by feb 2017.
If I look back to the places I have visted then I couldn't have done without the Landrover, I am totally self sufficient and can stay in the bush for 3-4 days before I need to drive to charge batteries .
Good luck with the trip
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