I use a heavy duty kryptonite chain with a mini-U lock for my Surly Big Dummy & a U-lock for the front wheel. The chain is nice for odd size objects where a U-lock won’t work. Like this one www.kryptonitelock.com/en/products/...
I think I chose this because of Lock Picking Lawyer on YouTube
kryptonitelock.com
Evolution 1090 Integrated Chain