I just landed my first rover on Duna, but it doesn't want to drive around! This same design zips around Kerbin like a tiny science race car, but just slowly slides down the very gentle hill it's parked on now that it's actually arrived at its destination.
I have plenty of power in the batteries and solar panels to keep them topped up. None of the wheels are damaged (the alt-menu boxes all say status nominal). I've got a probe core to operate the thing, and I can see the steering actuate when I tap on the keys. I've made sure the brakes are off, since I've been fiddling with them to keep still to save the game (you can't save while moving).
I tried the stuff in this answer with no success either. Any other ideas?