Get insulation n insulation board, stuff where possible n use the insulation board to hold in place, n maybe expandable foam around sewer pipes, then make sure the skirt around base of house is wind proof!
We wrap insulation around the heat tape that is on the pipes, it helps it not to run so much and also not burn out so quickly and keeps the pipes better. You can use foam (like pool noodles or something similar) Also, on exceptionally cold nights open the cabinet doors under the sinks etc. and also let the water trickle a little thin steady line . Water does not freeze as easily when it is moving.