This is very popular in Europe. There are many rallies organized each year. Many of them are organized in France.
If you go to some of the remotes parts of the world and you will see the most unsuitable vehicle that you believed had no chance of getting there is a 90 % chance that a french person drove it there.
It is not a criticism, it is admiration :)
www.theadventurists.com
This a 10 k miles long rally, organized each year starting in Europe and ending up in Mongolia. The participants have 1 rule. Only cars with a 1l engine maximum are admitted. Anything goes .
In france there is a very popular peugeout 205 african raid organized every year.
Dans trois semaines, les 65 équipages du 205 Africa Raid prendront le départ de ce rallye vintage et authentique sur les pistes du désert marocain. Aujourd'hui, la famille Jacquot qui organise depuis 2004 ce rallye, a organisé...
france3-regions.francetvinfo.fr
besides this organized events, I can tell you that I have seen personally many small cars in the most unexpected places...
How did they get there and was it practical, comfortable ?.. I have no idea..
There is also a tour of the alps organized each year by the owner clubs of BMW Isetta. This I have seen myself, I was on the Grossglockner High Alpine Road when they passed by me, at 2500 m altitude..
I have no idea of the conditions of where you want to go but, in general, it is doable.
In third world countries, people have to go on terrible roads and they don't have g wagons, most of them can't afford any kind of 4x4. And they travel and go with what ever they have available.. usually you average small car..