I have always been a fairly hard core camper, we only bought EHU 2 years ago.
However and I dont know if its just me but the camping season seems to be getting shorter and shorter each year 
Dd3 who has Asd has a massive fear of the noise that rain makes on the tent and I know it will be the same in a van but she will be further away from the roof if that makes sense.
We went away with friends over the BH and the nights were so cold but I was worried about letting Dd3 sit in their van in the evenings because then she had to come out and go to bed in a freezing tent!!
We dont have a big budget so it will be an old van but DP is fairly handy with mechanics and I am not afraid of a project.
Dont know why I am telling you this, I just feel a bit of a traitor to the 5 tents in my loft!! 