I had a LWB VW Transporter slightly smaller than a Transit Med wheel base and I could fit a d/f machine 2 blowers and a porti in, providing you put a shelf in. I put 1 in across the back but only half the way across and about 10" high, the buffet head quite easily slid under and the 2 turbos stood on the shelf, the remaining space at the side was for the porti and ontop of the tanks stood loads of chem and pads for d/f machine and nothing moved around.
Shaun