Most ATW (Around the World) trips are done with mildly built or stock vehicles. The reasoning is it's better to be stuck then broken down. If you have a built up vehicle that means you're going to have to carry a lot more gear to make sure other things don't break.
Those 'remote' areas are still on main roads though. So, if you wait long enough, someone will pass by.
When you think about it, the locals don't need lockers and winches. Most of the time they don't even need 4WD. Trips like these show you that you don't need to have much more then the will to go on an adventure. It's not about the vehicle or the gear. Although they seem to be going on main roads that are known to be open. It's when you get to areas that are unknown and rarely traveled, is where you need gear or a group.
A pretty cool documentary to watch is, Long Way Round. It's done by Ewan McGregor and his friend Charley Boorman. They decide to ride around the world on motorcycles. There are a lot of guy's on ADVrider.com and horizonsunlimited.com who have done ATW with pretty minimal stuff.
There is a sequel called Long Way down but it's not as good as they become a lot more commercialized and lose a lot of the feel that made LWR special.