Hi, That's exactly how I started out. Disco and wfp on a trolley, six 25ltr drums and away I went. Did find that she drank the diesel quite badly though, plus humping gear in and out of the back was a pain. Did think about a tank in the back with the seats either down or removed but then though about all the hassel to revert back if I was going out at the weekend.
Bought a really cheap Combo van and mounted a 200ltr tank instead, also carry a few drums and the trolley system too, (just in case) and it handles the weight no problem. If I'd done that with the disco it would have been on it's knees and have a worse drinking habit than me.
My only problem with the van is getting the water into the tank. Been out playing in garage tonight modifying the pipework.
See I have a stationary RO system which runs off an IBC which collects rain water or is topped off with hose if it isn't raining. The RO feeds into another IBC which is mounted on blocks so I can get my drums under the spout.
I've been running the pure into a drum with lid cut off and a submersible pump and inch and a half tube feeding the van tank. I know you'll say "why not just put the submersible in your pure IBC?" Well I would but the shed I've built around the IBC's makes it a bit tight to get in.
I really should take some pictures and see what you guys think. Heath Robinson maybe, but it all works and business is getting better.
I'd definately hold off on the Disco though, If only for the fuel and servicing costs (and I service my own)
Wanna buy a cheap "T" reg TD5 108000miles, with roofrack?