Check your unit. look to insure it will be big enough, clean enough and secure enough for the length of time you will be keeping your Items here.
Pack items in a safe manner. Use mattress covers and insure important items are enclosed in safe and waterproof containers
When you place your items in the unit make sure they are not wet. Excess moisture on boxes could cause mold.
Pack in a smart order. Some times you may need to store your items longer then you may think. Make sure seasonal items are easily accessible.
Pack tight. Make sure your contents are stable enough for transport. Insure breakable items are secured
While in storage check your belongings regularly.
Insure your trailer is safe. check regularly or after major storms for signs of pests, weather damage and theft.
Sweep your trailer and remove garbage from your trailer before pick up to avoid addition charges