I have moved exactly two tractors via trailer. A '48 C and a '51 Super C. Both traveled less than 20 miles, at speeds of less than 35 mph. Both were hauled on a 16' tandem axle trailer. In both cases five chains were used with three binders. The two without binders were tightened by moving the tractor until the chains were no longer slack, then the brakes were set, and the tractor left in gear. The three chains with binders were then put in place and tightened, two against the two without binders, and one pulling with them.