Snow rated tires are my first line of traction.
Second is 4x4.
Chains are the last tool.
Dont forget about chains for muddy situations as well.
I carry dual rails and single for the 4x4 wrecker. With a wheel lift making chaining up the rear so easy (put down to lift rear tires off the ground), I usually throw the duals if I feel the need to chain up for a job. Even though the chains are camed , I still use the spider style rubber tensioners. I also use a large zip tie to tie off the extra couple links of chain adjustment. Call me ocd.
If it’s a local dot requirement type of situation, then the singles get put on the outside.
Before I had the duals, putting the singles on the inside for goat road situations caught the ruts better. Dually trucks don’t usually drive on old forest service roads and are too wide.
Chain up rule: Don’t stick your head between your tire and wrecker body. Act like it could drop at any second. Arms in only and from the uphill side if there is a slope.