I’ve opel vivaro l1h2, diesel. Sometimes not that strong for steep inclination, but in general is fine. With mine 176cm i had to put matress/bed parallel to car axis. But for example citroen jumper is wide enough to put bed perpendicular - getting more space for other shit.
With diesel engine you can have cheap and easy diesel heating (webasto, or ‹ chinese webasto ›).
Chemical toiletes are fine, and you can find biodegradeable liquids, and there is many free dump stations of chemical toilettes. I dobt get why people still prefers to dig a hole in the ground every morning.
With openstreetmap map you find easily water sources, dump stations, climbing sites, and parkings. Google maps is not the best solution.
For internet buy local simcard if you plan to spend more than couple of months (and for balkans do it immediately, there is expensive roaming). Worth to get mobile router external antenna to have better signal.
For gas worth to find different ‹ converters › for your gas bottle that you will be able to refill it abroad.
Im living that way for around 5 years and main problem is loneliness. Most of the time you will be on your own, places like siurana chulilla chorro leonidio are good to find climbing buddies and community, but for smaller crags - better learn to rope-solo climbing.
80% people of white campers are retired males, you wont find connection with. Vans are rather younger people, but not necessary very openinded or friendly - like in normal world.but cases that whole parking doing something/integrating together - forget about