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The problem that you run into is that each state is enforces their own laws. I will give you a link to the Federal regulations, but your state may be more stringent. I have heard of people having problems with the PA DOT because they didn't criss-cross their chains. The feds don't require this. In a nutshell, mobile equipment weighing 10,000 lbs or more is required to be restrained with a minimum of 4 chains, 1 at each corner. Below 10K, the requirement is one chain per 10 feet of length. So, technically you should be okay with 2 chains on a small tractor, but your local law enforcement may not agree. The rule for what size chain you need is based on the load limits of the chain. 5/16" grade 70 chain is rated at 4700 lbs working load limit. The sum of the WLL of the number of chains used must equal or exceed the weight of the vehicle being secured. 5/16" will be more than adequate for your tractors, but it must be grade 70. I am not a fan of the pull over binders, but they are legal if they are rated for the load. Check out the document in the link that I provided and look at page 24 of 25. 393.28 would apply to your tractors. Read it carefully. It only requires 2 tie downs, but states that they must be capable of preventing movement in all directions. 1 chain run through a clevis will not meet this requirement. That's where they get you. To comply with that requirement, you really need 4 chains. I always use 4 chains and binders because it's the only way that I feel safe. Chains and binders are a small investment for the protection that they provide. One accident will cost you far more than all the chains and binders you will ever need in your lifetime. 1st Chain Supply has working load limit charts on there website along with a .pdf file of the latest Federal regs. Good luck.
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