We have a North Trail 26lrss and are heading from Glacier National Park to Yellowstone in 2 days. Nighttime temps are now forecast to be 15 degrees. We will have electricity at Fishing Bridge Park. Does anyone know if our rig can handle this and if there are special precautions we should take? I thought about adding rv anti freeze to the waste tank at night or draining it completely and leaving a faucet or two running into the grey water tank overnight with the valve open into the sewer. Any suggestions? We are considering canceling our trip.