The frame is 84 x 120. Built of 2" x 2" tubing with 2 x 2 angle weld on top. Bottom deck is 1/2" ply soaked in Rosewood oil, interior frame is 2 x 4 on the perimeter, 2 - 2 x 6s running the length of it. The interior is filled with 2 layers of foam board and the top deck is 3/4" birch plyu. Home depot had it for the same price as pine, so why not? Trailer weighs 680 lbs as it sits.