The tow test is a truck-pull up a 150-foot steep track. Each rig is tethered to a 6x6 and is allowed one pull. Then, The Frame Twister has evolved with boulders, the dogleg and the dreaded lop section.The tow test is a truck-pull up a 150-foot steep track. Each rig is tethered to a 6x6 and is allowed one pull. Then, The Frame Twister has evolved with boulders, the dogleg and the dreaded lop section.