Advice/help: Offroad-“Camper”

Hello together, since we are planning a holiday in Iceland this summer and one is only left there in the “inner” of the country with a 4×4 drive, but we want to spend the night in our own vehicle for cost reasons and for the sake of simplicity, we seek a compromise from it. I do not think that too much emphasis must be placed on the off-road capability, because we do not intend to drive on the extreme highland slopes with river crossings etc.. For this we also lack the corresponding Offroad experience. It’s more about getting up a slightly steep gravel road, for example, and as I said, a 4×4 drive in the area is probably required by the authorities. My biggest “problem” is that I don’t know at all about this used car sector and I don’t even know what kind of vehicles are in principle in question. So far, I only have a VW T3/T4/T5 with Syncro/4motion drive and camping or Multivan equipment or a Landy with e.g. Although I am rather skeptical about the long-haul capability of T3 and Landy (are just a “pair” km of motorway). Does anyone still have an idea, which vehicles would still be in question? Thank you very much! 🙂 Ciao Flokko