Just make sure you have everything well secured in the back of the van- esp the tank, what size you going for?  I'd recommend no less than 400ltr.  Normally the systems we build use 85/110Ah batteries, 6.4ltr/min pumps, varistream, microbore hose, metal floorstanding reels etc.  Buy the best you can afford, you'll not regret it in the long run.