PDI During Winter Question

Thanks everyone we will be going 4 hours from Pittsburgh to Cogan Station PA the weather Friday into Sat is supposed to be into the 50's but low in the upper 20's so should be OK. They did finally agree to put inside for full hookup and convinced them to put fresh water in the system for our overnight stay on their property outside. I will not lie I am a little nervous doing this during the winter not sure if would have purchased if they stated would be doing the PDI in January. Originally was told would have in November.