We used Landa mini skid mounted across back doors. Left about three feet on right side to access jack, climb in to fill diesel tank etc. Hose rels were mounted at side door and angled back for acccess. Its workable but it is tight. For the exhaust I had a fabrication shop mandrel bend me a stainless steel tube and coupler. When we pulled to a job, the tube was slid onto the exhaust outlet and vented up and out the back doors. This was also a pain because when a job was finished that tube was pretty hot so we had to handle with welders gloves and put it back onto its holding mounts in the van. You can come up with something more permanent but I didn't want to cut holes in the van's roof.