Check out this link below for some great tips on how to use safety chains. And why not to twist them as U-Haul recommends.
The Low-Down On Twisting Safety Chains – From The Mechanic’s Post (mechanicalelements.com)
The video below has both good and bad tips. First the bad u-haul is recommending that you twist the chains to shorten them as the link above details out this is a major no no. As it drastically reduces the max load of the chains.
Here is the good tip. if you chains are too long as often is the case with safety chains you can shorten them buy passing the chain thru the loops on the hitch then clipping the chain to it-self. This works great if you can get the hook thru the loop in the hitch which may not be possible.
The below video shows what happens to the max load when you twist the chains.
Trailer Towing Tips — Be Safe And Have More Fun When Towing A Trailer. (synthx.com)
Good Ways To Shorten A Trailer Safety Chain – Mechanical Elements
Trailer Attitude – A Look At Trailer Pitch, Yaw And Roll For Towing (mechanicalelements.com)