Under normal NM winter weather, you should be pretty well protected due to the new/quality of your 5th wheel. Ask at check-in about their winter water policy. Most parks will tell you to go to tank water if there's a freeze chance. The inside warm will keep the interior pipes safe and any fluid in the tanks shouldn't freeze unless it's a catastrophic event. In rare cases, leave the hook-ups attached and trickle the water thru the pipes, tanks and out the sewer hose. Heat pumps will not work below the high 30's, so you'll have the furnace floor ducting to help the pipes too. Fluid will slosh in the tanks while moving. Eagles Nest is in a valley, so windchill could be worse at other locations.
Eubank may be your best expert for what to plan for.
