Andy. Sounds quite bizzar having a Cub for backup to an 18. Then most folks just don't realize just how good the little tractors are. I do know a guy who experienced his weight making the difference with a dozer. Different make but about same size D-7. He had pushed out over a plaster pit, ground dropped from under him part way from front to back. Every time he tried to reverse machine would tip foreward. He tried getting off to go for help, same thing it needed his weight to stop it fron tipping foreward. For those who don't know what a plaster pit is. In areas where there are gypsum deposits, it cant rot out. Usually the soil doesn't drop until disturbed by a machine. First time I ever saw one of these, I was disking with 1066. Noticed a hole about 2 feet across in my last pass. I got off tractor, walked over to investigate. Here was a hole in ground about 20' deep and funnel shape. (wider at bottom) This was on a farm I had just acquired, thus was new to me. I had never seen anything like this on my home farm. Later that day I related what I saw to my dad. He told me of one he saw about 3 acres in size and deep enough water had filled the bottom surface. The one my dad saw, they had threshed grain on the surface the day before. They had left with all equipment the night before and were returning to press (bale) the pile of straw. The straw was gone, except for a bit floating on water. These are quite dangerous. My friend with the dozer doesn't need convincing anymore. Farmer he was bulldozing for notice he wasn't moving. Came and hooked Farmall H on, this allowed him to reverse and back without tipping foreward.
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