I bought a 2006 StarCraft 3608 PUP but it desperately needs new safety chains. The GVWR is 3500Lbs. My question is, what size and rating of chain and hardware should be used? I've done a little research and found 1/4", 3/8" and 5/16" chains. I'm also not thrilled with how the current chain is attached as it only utilizes 1 long chain and 1 bolt attached to the receiver behind the trailer jack. Any suggestions will be appreciated.