Our 1972 Jayco didn't have low point drains. All the water lines were inside the unit and ran through cupboards and walls to get to where they were needed. Of course that was before the days of PEX and even before most of today's plastics. The water lines were all 3/8" copper with flared fittings, not even compression fittings.
So, it is remotely possible that you don't have low point drains on your RV, but I'd at least look once more with a "keen eye" toward looking to find evidence of where they might have been, things like empty holes in the underside of the floor, patches applied to the underlayment, or foam/silicone "bumps" in the underlayment. If you don't have (or simply can't find) the low point drains, you'll be forced to use RV antifreeze to winterize your system, otherwise, you won't be able to get all the water out and it will freeze if not diluted sufficiently with antifreeze.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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