I was just thinking the other day when I was taxiing my passenger plane to the runway. I was thinking, it would be really useful if the landing gears had motors in them so we don't have to use our engines (and therefore expend fuel) to taxi to a specific location.
Let's say you sent a resupply SSTO to Duna, but you overshot the base. It would be much better to use in-built motors to taxi to the base, instead of expending valuable LFO just to travel a kilometer or so.
Of course, the motors would use electric charge and have maximum loads, much like actual rover wheels in KSP.
So what do you think?