schlep1967 wrote:
The answer was touched on above. If your low point drains are like mine they have a screw on cap on hard white plastic. No valve. You unscrew the cap and the water comes out.
The answer would be, IF you can get to the area above the floor where the drains come down, do a little plumbing work and put valves above the floor and run pex down for the drains.
That's exactly how our Northwood is plumbed; There are valves inside the heated area that redirect water out the open lines on the bottom of the trailer. We have no caps.