Got up yesterday morning (7:30am)and had very little water flow in the toilet but the sink and tub worked fine. It wasn't super cold last night around the upper 20's to lower 30's. I'm not sure how this trailer is plumbed I think the line runs to the sink then the toilet then the bathtub as they are in that order in the trailer. About 11am it started to work fine again. I kept the trailer at 65 last night, so it shouldn't of froze the lines. Besides its a Arctic Fox you are suppose to be able to camp year around. Maybe the line didn't freeze maybe the toilet valve is defective. Does anyone have a idea how to diagnose this problem for when it happens again so I can correct this.