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I just winterized my 3402RL and both my daughters TT and HorseT, the systems are all similar in the way they work.
The most important thing is to make sure your hose is tight as any air leak will stop the pump from priming as has been mentioned. As also has been mentioned open up a tap somewhere, I use the low point drain and put an empty anti freeze bottle under it to collect any anti freeze that comes out there.
The pump is capable of drawing water from a long distance, my fresh water tank is at the rear of the unit and the pump near the front, that is about 30 ft or more, it just won't work if it is sucking air.
The thing I dislike when winterizing is not being able to turn the pump on and off at the convenience center, I intend to correct that this winter while in the warm Arizona sun by adding a switch in line with the one at the main panel.
I take my anode out and leave it laying in the water heater compartment, that way I don't lose it or forget it is out. I have a spare as well.
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