H&S - Model 36 and 40 Top Dog - Semi-Trailors Forage Box - Brochure
The main frame is made of high quality formed steel 10" I-Beams for the rear, and compressed down to 5.13" in the front with full length front gussets. New 25,000# spring axles w/heavy duty spindles are standard. 16 Gauge Stainless Steel Sides.