Need more length on safety chains!

I have BROKEN many of the repair type chain links you describe. I have used them for rigging on my UTV to pull stuck vehicles out of the mud. I have also used them for the lifting mechanism on my snow blower attachment for my tractor. They are very easy to work with, but easily snap at the threads and pull apart under shock force. I WOULD not trust them for my trailer chains. They work great to the rated forces when the forces are applied slowly, they quickly break when those same forces are applied rapidly (and how rapid would a travel trail pulling off the hitch be?)

Replace the entire chain instead.

I would also go with a complete new chain and then attach it with a good strong nut and bolt to each side of the A-frame. this will be a much better fix and be stronger than when it left the factory. just look at that little welded bar they are attached to on some trailers!

I use to have clamps like the one burbman uses hanging off the back of the truck. The holes on the hitch were too small for the chain hooks so I put these on so I could connect the chains.

Really, to keep it a clean installation, Home Depot sells chain by the foot.

My TT came with 5/16" chains that were attached to a piece of 1/4" rod bent into a loop and welded to the TT frame. The old chains were badly rusted so I cut them off and replaced with new 5/16" chain attached to the welded loop at the frame with 3/8" repair links like these:



The 3/8" links were rated just a few lbs higher than the 5/16" chain so figured they would be OK. There is also the clevis hooks and the attaching points points on the receiver to consider...even if you had a chain rated to hold the weight of the TT it probably wouldn't because the whole assembly is only as strong as the weakest part.

Can't go wrong with these. Anything rated for overhead lifting will work within your rated load. I use a larger size of the screw shut links you are describing, which are rated for higher loads, but if you're using them, I would get a rating that would hold the entire weight of your trailer, not just 1/2 of it. Some of those type are rated for overhead lifting and some aren't. You should go on the supposition that only one chain may be keeping the whole mess together. Obviously, if NO chain is holding the whole mess together, you have a much bigger problem. If buying the connectors in my link, you may want to just price longer chain instead. Might be cheaper in the long run. Another thing to consider is, the chain your trailer came with likely isn't rated for overhead lifting either, and it's likely poorly welded on. There's a line at which we have to recognize we aren't flying airplanes. My .02.

I would replace the whole chain. They are not that expensive.
Remember, a chain is as strong as its weakest link!

NO, use the folded complete link that you have to pinch closed.

IMO it would be but I am not a rigging expert.