You can try putting a repellent such as
Roadblock for rodents in the areas where they are causing damage though over time the rodents will learn to ignore any repellents (repellents should only be used as part of your rodent control efforts) . You should also try to seal up the apron around the trailer so that the rodents cannot gain access. Putting out
tamper resistant rat bait stations loaded with rodenticide will help reduce the rodent population in your area and should in the end help limit any damage these rodents may be causing.
