The extra water tank in the IP26Mkll boats, as I understand it, was a "charter" option for cruising to increases the water capacity to 72gal. However this tank appears to be effecting the trim and waterline at the aft end of the boat. Does any one know anything about this extra tank option. I and my surveyor have emailed both Kirsten and Warren at IP Yachts more than once but they have failed to reply to our enquiries. I have attached the letter that my surveyor sent to Kirsten and I forwarded to Warren.