High-roof combo/ Minibus/ Van Camping suitable wanted !

Hello dear car friends! Unfortunately, I don’t even know about cars at all, my friend unfortunately just as little. Since we both still study but don’t want to do without regular holidays together, we had the idea to put a car in which we put a small bed / install/ whatever can and in which we also get enough luggage. We actually don’t know any more, we could spend a maximum of €6,000, but would also like to buy a car. After a short search at mobile.de we saw that Ford Transit Connect models already have 50,000 km down for 5,000€ and were already quite euphoric, but then we happened to read that this car was anything but robust. We didn’t hear much about the Opel Combo either, but a T5 that we hear is robust, costs at 120,000 km still 8,000€. Now I wanted to ask if anyone from eu ch maybe knows which car is particularly robust in the direction of transporter/minibus/high-roof combi. We know that on the way there is always something that can happen and you can’t predict it, but maybe there are models that are particularly “practical” for our purpose?! Or do you think that car with 120,000 km is also ok if it’s from VW or Mercedes? I’m sorry that my question is so largely, but I don’t know how else I could find out what suits us. U And since we both really only earn 400€ a month it would be very annoying if the car what we have saved for years would be a fall! I would be very happy about the answers!