Yes, but not to us.
Sales tax requirements are set by each individual state. Most states DO require you to pay sales tax. You do not pay it to us a dealer though, it will be paid by you when you register the trailer at your local DMV. In order to register your vehicle, you will need the Bill of Sale along with the Manufacturer’s Statement of Origin (MSO). Both of those documents will be provided by Custom Trailer Pros. They may also require additional documentation (such as proof of insurance). Check with your local DMV for full requirements.