Setting up an under frame mount coupler with WD setup

[Frozen001]

So if you read my other post about the hitch failure (Hitch Failure), you will see I have to help my father set up the WD setup for is new trailer. The trailer has an under frame mount hitch, so when the dealer set it up, getting the chains to reach the snap up brackets is tough. I know there are some pretty knowledgeable people on here about setting these WD hitches up. I am looking for some pointers.

[1wayhighway]

You can go to Reese's web site they have instructions on how to set it up. Once you do that go to a cat scale and weigh the setup to make sure you are at least close.

[Hondavalk]

There are some very good videos here.
etrailer.com