The company that you purchase the trailer from can give you that information.
When I looked into it 4 years ago I believe it was 1.50/mile, and if there was not anything for them to pick-up for the return trip, it was 1.00/mile (4000 mile round trip), so I made the trip myself and picked it up.
Dave & Paula
Why pay someone to take a vacation with your trailer. Drive out and pick it up and have a real nice vacation back on the money you would pay to ship it. Trailers are built just for this type of vacation.
Assuming you are referencing an Escape trailer , the cost posted on the Escape website is $2.25 per mile
Your original post gives no indication of the brand of trailer you are referencing so I am making an educated guess .