I responded in more detail via e-mail. One variable that has not been addressed here is the variability in the nighttime temperature. If you are sure that it will be around 27* for example, the thermal mass so the camper may be fine although you might have outside shower issues. On the other hand, she is talking about upstate NY and the temps can be pretty variable by late Nov. You might think that you will have 27* and then after you leave unwinterized you might encounter 20*. It is all about the risk that you are comfortable with.
Also, the brand of camper and its construction makes a huge difference. Bigfoot is probably the best for dealing with cold without issues as it has heated tank compartments. Others without a true cold weather build will have less protection.
The other issue to consider is access to plumbing that is damaged. If you have any access a fix is easy. For most of us, access for repair and maintenance is not really designed into our rigs and that should make us more cautious.
