Welcome to the site GoDano. We are in Midwest Georgia, but have visited Denver a few times in late October with it in the teens at night. Everything above is great advice. All our plumbing that is not above the floor line is in two compartments, that get ducted heat from the furnace. Great, except after three very cold days, we ran out of propane. We picked up 750w heaters for each of the two bays. They didn't have t-stats so we found this thermo controlled plug and use them. These two are on a separate cord that we plug into the pole, since our RV is 30amp. We then use a larger electric heater inside the coach. Also put wireless thermometers in those bays so we could see what was going on. You'll be fine. Enjoy!
HEATIT ET-21 Freeze...
https://www.amazon.com/dp/B074HVYDV1...p_mob_ap_share
AMIR Indoor Outdoor Thermometer,...
https://www.amazon.com/dp/B07JGRBZBB...p_mob_ap_share