Oz, i gotta say over here in WA there really is no such thing as a rust free van. I bought a one owner HX that was garaged, low kms etc etc and it still had the usual cowl, rear 1/4, sill, door and fender rust. It had absolutely none in the roof and seams tho. (hope the pic works!)
Nick i reckon avoid the ones with rust in the seams and gutters if poss. Pretty hard to repair properly from what i understand.









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