Although the Airstream's frame will definitely handle the load of towing with a full fresh, the question is what else do you have on board? If you're near the max weight through your gear, clothing, groceries, etc, then you need to think about the 320 lbs that a full fresh tank adds to your total weight.
Because we're towing with a Sprinter's smaller engine, we are very weight sensitive, and always tow with about 1/8-1/4 tank of fresh--just enough to get us through the day. If we're going to dry camp, we plan ahead to fill the fresh as close as possible to our final destination. We definitely notice a difference with more water in the tank. Have not experience a problem with 5-10 gallons sloshing around.
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