How's it Johan
I did Richtersveld in December before, lekker hot (some days hit 45) but easily survivable if you carry lots of water as stated. We took 25l between wife and myself just for drinking water. That was for about 5 days. Find a shady spot where possible (Potjiespram is one of my favourite spots).
Careful driving and wheel placement is the trick. We lost no tyres, in fact not even a puncture. I remember traveling to one site on which (I thought) the road was pretty technical, when an old 4x2 Hilux came flying past me carrying about 10 workers on the back.
I have done the whole park in my X-trail and got stuck once in heavy sand, but managed to reverse out and take an alternative route.
I will be passing through Richtersveld this December in the Patrol, on my way up to Luderitz. Maybe we can have a cold one somewhere