When planning an overlanding trip the question for the size of the car will come up, if you don’t already own one.
For the moment I’m gonna leave technical details aside, like 4×4 or not or which brand to use.
We started, as you might know, with our Chrysler Voyager GS. Its the long wheelbase version and has 2.4 metres of space behind the seats to the back door. So a bed fits in and quite some additional stuff, but we don’t have a high top roof. Although the Chrysler is a great, comfy ride and went through many adventures with us, we learned that we miss a space to stand up a lot. We underestemated that need completely.
The Chrysler without a high top roof is too small for staying for extended periods abroad (6+ month) . This is not a general rule, its just our opinion, because we know about people who stay in similar sized cars for years. But they are more the exception, then the rule.
Speaking from our experience a car like that with approx the same interior size is good for a trip for like 3-4 months maybe up to 6.
For everything longer then that, a high top roof is a real bliss. It doesn’t have to be full standing height, but one should be able to stand at least somewhat, to undress, and do many other things which can’t be done comfortably while sitting or lying and you don’t want to do outside, when being in a lively parking space in a town.