Steve, our low point drains had caps on them, just unscrewed the caps and let whatever was behind them drain. I also opened the faucets inside just to be safe. You'll also was to remove the anode rod from your hot water heater and drain it as well. Normally takes a 1-1/16" socket. I am sure there's something I've missed here, a good search of the archives will tell you more. Being here in the DFW area we don't get too many freezing nights, so I do what I can and hope for the best! So far so good!
2016 Wildcat 29RLX
2011 GMC Sierra 2500HD Duramax CC
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Pullrite Superglide 18k hitch