Trail-Blazer Models Header Transports are built with a stronger arched main frame to carry the heaviest heads quickly and easily. Heavier 4” x 8” thick wall steel tubing is used on both the frame and the upper bar to carry larger and heavier heads with less stress. The front swivel ball axle provides excellent tracking and maneuverability. The rear tandem torsion-flex axles with highway speed rated tires absorb the worst field and road conditions and reduce stress on both the head and header transport.