I need to purchase a chain to tie down my tractor when hauling it. The tractor is a TYM 2515h and weighs around 3000 lbs without the loader and close to 4000 with the loader. Will a 5/16 inch chain be sufficient or should I get 3/8 inch? The 5/16 inch yellow chromate chain has a load capacity of 4700 lbs and the 3/8 has a capacity of 6600 lbs. From the numbers I would think 5/16 will work unless I'm missing something like stress load while braking etc. Any ideas?