Welcome to the seadoo forum rangerrookie. The 1995 speedster will do the trick for pulling a tuber or a skier. It has plenty of power and speed too. The 21 gallon tank will vary based on full throttle usage's. I own a 1997 Challenger with a single 787 with 110 hp, and it runs for 8 hrs all day on a full tank of fuel, with some left over. You have twice the engines so figure it to twice of consumption. The draft on mine and yours too, is about 12 inches. but add number of passengers and fuel, plus gear, it might draft maybe 15" give or take. I haven't heard anyone complain about there twin speedster. If you want more information on the speedster you could sign up as a premium member and be able to download on line or print off a operators manual and a shop manual for maintenance, in case it needs some TLC. The Seadoo Forum 's library has a large selection of manuals with troubleshooting diagnostics, pictures for repairs, and regular maintenance.Click on the link at the top of the page under "Seadoo Manuals", for more detailed info.
Good luck with your purchase and if you need any help or have more questions come back and give us a shout. This forum has a lot of active members that are eager to help.
Karl