My high recommendation for rough road suspension is SEIKEL “Desert” lift kit for front-wheel drive or 4 motion
http://www.seikel.de/shop/desert-lift-kit-for-front-wheel-drive/?lang=eh With monroe shock absorbers. I ride cca 4000 km with standard suspension and than change for seikel with monroe on my T6 Beach. I can tell you after another 15000 km that it is more comfortable ride on every type of road. 1
btw. my T6 is 4 motion with HD anti roll bars and Michelin Latitude Cross 17"
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