Overlanding sells in the video game business, or so it appears.

Over the weekend a new game names Sprintires became one of the top selling games on Steam, holding the number one spot. This is a big achievement in the world of game development, and not one that is easy to accomplish. So what is the game? Here is a discription on Kotaku, and video game business news site:
Spintires is a hardcore, all-terrain simulation: it tasks you with driving cargo through awful, super muddy Russian roads with nothing but a map and a compass. Ideally, you transport your cargo without spending too many resources (like fuel) or without banging up the truck too much.
Here is a video promotion of the game – It looks like a typical day on the trail!