No brakes isn't safe or legal in most states on a trailer that size .
Specifications. Model, Flatbed Trailer (M1061). NSN Number, NSN 2330-01-207-3533. GVWR, 15,850 Lbs. Curb Weight, 5,850 Lbs. Tires, 12x16.5 LT Tubeless.
http://www.towshop.com/trailer_supplemental_braking_laws.htm