One way to save money when renting a trailer is to ensure that it is properly insulated, because improper insulation leads to very high energy bills. If possible, choose a trailer with an efficient central HVAC unit. If such a unit is not affordable, use clear plastic to cover the trailer windows and install weather stripping beneath the door to reduce the energy bill. If you can pick a location for the rented trailer, choose a very temperate area.
Another way to save money when renting a trailer is to install partitions for areas that are not often accessed. This includes storage areas of the home or areas used only occasionally by colleagues in office trailers. Installing partitions to block off such areas when they are not in use can greatly reduce the energy bill.
Depending on how you plan to use the trailer, it may be possible to save money by writing off certain business expenses. State laws vary on the specifics, but many areas allow individuals to claim deductions on taxes related to trailers that are used solely for business. Similarly, if a trailer is intended for business purposes, it may be possible to claim deductions on the cost of the purchase and installation of any equipment necessary for the trailer.