When it's all going as planned and the rover is tugging from one mission to the next, it might get a little too predictable. Lets throw in storms! They can be small like dust devils or massive (a planet wide storm was detected by the mariner 9 probe).
Rovers don't last forever, dust collects on the solar panels thereby slowly draining their capability of recharging. Dust devils can then be a great help: on two Martian rovers they blew away dust from the solar panels.
I think it'll be more exiting if you have to keep an eye on the horizon to spot an incoming storm. And then try to hide behind a rock or postion the rover on a steep crater wall. And it also gives you a dilema: when will wind blow your panels clean and when will they burry your wheels in the sand?