Kaufberatung – Bus for conversion as campervan – Budget max. 8.000 Euro – km < 150,000

Hello together, for a few years now I dream of buying a minibus and converting it as Campervan/WoMo. Now it is finally time. I have no idea of cars at all. I can check oil, water etc. on a regular basis and I am very fit by the car technology but I don’t have a plan. But I’m willing to learn I swirl between Renault Trafic/Opel V./Nissan P. (for the price still quite new BJ and less consumption but apparently often problems with Getri ebe and other expensive repairs) and T4 logically old BJ with frequent rust problems and more consumption???? but for that the T4s, after what I read so much, should be more reliable than the T5s. With a budget of max. 8,000 (preferably 5-7) and maximum around the 150,000km (best about 100. or lower, what would be euro favorites and why???? Now shoot off, be curious to your opinion. Can also be a completely different vehicle. Thanks already and greetings Kayro