If you are shopping around for boat storage units , then you are going to have to be sure that you are buying some extra supplies for your boat as well. Of course, you are going to want to buy a cover for your boat, as you are not going to be able to find a better way to keep it safe from changes in the weather and humidity. Additionally, you are going to want to buy some engine fluid, as you would hate to return to your boat to see that it does not work as well as you remember.