I agree that a low-point drain is a good idea, and also that it is far from adequate. You can drain the pipes just fine that way, but the fact is that PEX is very unlikely to be damaged even in a hard freeze. The real problems are plastic fixtures, pumps, etc. They accumulate water in nooks and crannies and nothing short of compressed air will clear them safely.
That said, once mastered, compressed-air winterization is quick and easy. I typically do it several times in a given winter, since we do not hesitate to take the rig out in cold weather, or to enjoy ALL the systems when we do so.
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Now: 2022 Fully-custom buildout (Ford Transit EcoBoost AWD)
Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)
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