Yip, I've been following

I believe in treating the dealers as we would like them to treat us. In other words, phone the service manager and discuss your needs with him. See what he can do to help you. If you feel that you are not getting there, send me a PM and I'll give you a name further up the food chain

But better still
If you were to search for the thread by MrG on the 4x4 forum, then you will see a much better solution. As a matter of fact, if you want to go with MrG's brackets, order two sets and I'll take one off your hands.
The Mitsu brackets made a big difference to my car, but I'm sure there is still plenty room for improvement.
To get back to your original post. I agree with everything said so far. The corrugations are really bad, but we were so lucky last time round; when we travelled from Mata Mata to TW, we were following the tractor that pulls the "road grading device". Man, that made a huge difference.
As a matter of fact, it was after that trip that I started to ruffle Mitsu's feathers to get my dash sorted out. That holiday included the stretch from Luderitz to Swakop (past Rostoc Ritz). Man, there were some seriously corrugated sections on that road. Good thing we pulled in at Rostoc for some cold refreshments, Walter gave us valuable info on a better route to follow towards Swakop.