Please consider adding a mechanical parking brake to all rovers. One that doesn't require power to stop the rover when occupied. It is quite the experience to run out of power down a hill, and have absolutely no way to stop your rover from falling into a pit. A mechanical brake is common on most vehicles as a safety measure, since it requires no active power to engage. Please consider adding stabilization arms to large rovers with cranes, these will lock in place when the crane seat is occupied. There is still a problem with entering a crane seat and the rover starts sliding down a hill... and since you aren't "driving" it, there is no way to stop it, without exiting. The world isn't flat, and shouldn't be. But having no way to deal with inclines when in a no power scenario is a real problem.