rog et al,
another method is to cut a slot in the frame of the trailer that recieves one link of the chain.
then a rod is passed through the link on the inside. the rod is welded to the frame. no welding is done to the chain.
now, before you all freak out about cutting into the frame. i have seen this on trailers used for the utility industry. butlers, keifers, etc.
I HAVE NEVER SEEN IT ON AN AIRSTREAM!
just passing on info on how other manufacturers do it.
my excella has a "C" shaped link that has both chains attached to it, this is welded to the frame under the hitch.
again, no welding is done to the chain itself.
remember, your chains should be short enough to not allow the tounge hit the ground. (and crossed under the hitch)
i lost a trailer at work due to the pintle not being closed, believe me, this is possibly the most important thing you need to do other than making sure the brakes work!