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yes definately get 2, i don't know what your unger 1 is but with your tap tds you could get 2 di built into your van or like me have them at home & fill with pure, i have berlingo with a 750 payload & it takes all my gear a full tank & me & my son & we're both over 6ft & it still flies, if i had a bigger van dispatch/partner i'd have my di in the van so i could top up at jobs. with twin di i use about 600 ltrs a day & buy resin about every 4 monthsThat's low tds where are you Simon? Advantages over twin Di vessels? Should I invest in two?