When we bought our pontoon boat, the people(retired couple) gave us everthing, guess they were getting out of boating completely. One of the items is a "Extreme Performance"- the big one tube. I pulled my son around on it for awhile- 20,30 minutes. when we stopped and he got back on board, I went to get the tube, not sure how much water was in the tube but I had a hell of a time getting it out of the water. Felt like it weighted 70-80 lbs, question, is that much water commonly inside the liner incasing the tube, seems like I am pulling around a sea anchor