Sorry for the shit picture.
First I wanted to mount it in front of the van and blowing air to the back, but that's where the fueltank is on my van so there was no space for the exhaust and air inlet to go through the floor.
Now I mounted it under the bed and blowing air to the front. The way it's mounted now is temporarily, I will make a cabinet over the entire width of the bed and it will be placed in there. I'm also gonna put a t-piece on the air outlet so the air will also go into the 'garage' to get the moisture out of there a bit too.
For now I placed the 10L fuel tank under the bed too but at some point I will connect it to the tank of the van.