I second rumbleweed - when we winterize we do as the manual states. The drains are designed to drain all the low spots in the system. The key is to have all the faucets open (kitchen, bath, shower - in and out). We typically open the drains before we leave the last campground and drain on the way home. The bouncing and varied terrain help clear out the last bit of water. Having the faucets open creates an opportunity for any remaining water to evaporate - and gives a bit of expansion space if it freezes.
I remove the kitchen faucet and take the shower hose off as well. They both just screw on so they are easy to remove.
We have single digit temps here in the winter and I've had no problem.
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