You are very right to ask the question. A lot of people want to be prepared for all eventualities and there's nothing wrong with that but there is a 'trip fever' which takes over, fueled by forums and kit sellers.
Having 4x4 in Africa is going to help in the sand and the mud but in poor terrain a standard 4x4 fails pretty quickly, especially if overloaded.
NB there is nothing to winch off in the sand - a 10 ton truck needs a big tree to winch off.
In snow and ice I would prefer a robust 2 wheel drive with snow chains than a 4x4 with road tyres.
My first question to you would be :-
Do you want to live inside the vehicle campervan style of do you want to camp with the vehicle (roof tent etc)?
You need to ask just how much serious off road
A 4x4 van kitted out as a camper for an extended trip around Africa is not going to be able to do 400Km dune crossings in Algeria so you may well need a big truck but that's not exactly low profile. It will also be very expensive
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Chris
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"Never have a stupid argument with an idiot - he gets a lot more practice than you"
there I go again
not too hard really
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