I have a ratchet strapped tank using the existing eyelets, therefore no need to put a modification on insurance. It's a lay flat tank so the centre of gravity is spread across the whole back part of the van, and I built a fibreboard table to go on top of it to mount a fixed hose reel and gubbins.
Hose reel is mounted chest hight no need to bend over just open door and grab and go.