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I'd also bet it's the low point drains. If they freeze far enough into the belly they will shut off the lines. The lines still having flow probably do not go through that point. The hairdryer trick worked for us on our 2003 3295RK.
You can try wrapping insulation on those lines but in my experience that only buys you a couple of degrees. I had to wrap mine with heat tape and then covered that with insulation and duct tape to keep it all in place. But in your situation you may not want to bother with that. The heat tape and insulation stayed in place for more than two years and probably 30,000 miles without a problem. If you do use heat tape, get the kind that can be wrapped on a pipe. Heat tape I found at Lowe's and Home Depot cannot be used that way. I got mine at Tractor Supply.
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