Many dealers are unable to make any changes to your order once construction of the trailer has started. Since most trailers are built in an assembly line, making a change to the order would require interruption of the entire assembly line. In addition, your trailer may have already been constructed in such a way that making a change would not be possible.
For example: The trailer has already been framed, painted, and walls and floors installed. If a customer wanted to now add a window, it would require significant disassembly of much of the trailer and wasted materials.
Be sure and check with your dealer concerning order changes.
In the event that your dealer allows you to make a change to your order, make sure the change is in writing and that you sign and date the order.