I am assuming under the trailer was dirt and the trailer was under penned..the mother would have dug an area out to deliver the pups, the ground normally keeps a certain temperature and the mother would have cuddled the pups keeping them near her body temperature, same thing goes on in the wild, the mother finds a place to her liking to deliver her litter, in a hollow log, under heavy brush, under heavy rocks or cliffs, nature takes care of its own, and the earth nurses nature, just think about it, and you will realize how the animals in the wild survive and multiply.I keep the room 90F where I keep the mother and her pups for a few days. I think a week? 4 or 5 days? Then a decrease each week after the first week. I didn’t answer because I have not raised a litter in awhile, and thought my memory of those instructions from the VET was not the best source for helping anyone. If I was expecting a litter, I would be rechecking exactly what to do to keep them warm enough and for how long anyway. I’d be interested in hearing how you do it Rebel. You have raised far more litters than I ever will.
I am aware of a beagle who gave birth to a litter under a trailer when the owner got in an accident, and was not home. The neighbors checked on the house for the man, knew the pups were there, but stupidly did nothing but put feed out for the mother. It was 30F during the nights. The man worried that he had lost the pups, but when he got out of hospital and back home, he found 5 pups nursing on the mother. Now let me throw a question out. How did those 5 pups survive?