A bit of help for draining your tank,
You do not need to use the pump (although if you are winterizing do cycle the pump once you think you have drained everything to remove the water in the pump housing)
It sounds like you were drawing a vacumm on your system. For all but the FW tank you need to open up an inside faucet to allow air in. For winterizing, open all of the faucets (including the outside shower) to prevent any runs of piping from not draining - ALWAYS ENSURE YOU HAVE TURNED OFF THE HOT WATER HEATER FIRST.
The FW tank is on the depressurized side of the piping system and should have drained freely with air coming in through the vent that is part of the external filling connection. If I remember correctly (and if it didn't change for the 07 year model) the tank in the 2720 is under the sink. See if you can trace the line from the tank to the connection in the sidewall and ensure that the vent line is not crimped or pinced somewhere impeeding the flow of air into the tank. Air should flow freely into the tank (to replace water as you use your on board tank) otherwise you would end up drawing a vaccum on your tank which could lead to damage to your pump.
So congradulations on overcoming your first trip obstacles. While you overcame the draining problem this time I believe you still have the basic problem and it has the potential to cause you related problems in the future, so check out your vent line.
Bill
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