Use a couple of tractors, hook to the ski rings on the transom and the bow ring and have each tractor back up; this will pull the rope tight and you can then turn the boat upside down and it wont hit because it will be off the ground.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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