Lee, From what i understand about it, you might be better off buying one of those trolley systems. They come with a pump, fittings, some hose i think, and a trolley, and all you do is fill a 25L container from your DI and attach it to the trolley.
So you could make up 5 or 6 25L drums and just carry one or two in the van along with the trolley.
I think you can get some average poles off ebay, the ones that you just plug n play. otherwise, you may get a pole with the trolley from some suppliers.