We plan on shipping some calves tomorrow and the temperature is 10 above, we have a wilson trailer that has 3 rows of the small holes and 1 row on top with the big holes. should I be installing some incerts in these holes when shipping in cooler weather? If so how many of the  rows would you install the incerts. What is the proper way to install these plastic incerts?  The distance from farm too sale yard is 16 miles.