I got caught in a freak snow storm with my new trailer (comong back from factory after repairs). After a night at a hotel we started out for the pass.

Since no snow was predicted, I had no chains but I was amazed how well it pulled. These trucks are so heavy that they just claw along. I do have M/S tires that are only
slightly aggressive.
In this pic, chains were required but I had none and frankly, there was no way to turn around.

I still don't have any chains. Been in snow deep enough to push it with my bumper. Been in black ice and tracked fine, albeit slowly.
If I had chains AND NEEDED THEM, I'd put them on the back.