A 1.5” might work.
None of the B’s I have owned, B2620/3200/2650, have had enough clearance for chains. So I have never used them.
I have thought about using chains on the steering axle, but never followed through.
Good luck.
Hmmm... I wondered about front chains.... Yeah, the only reason I was considering chains was to combat some of my many slopes that get a little tricky to navigate in snow... I'm getting older & losing my balls... Seeing the prices for spacers is another reason to rethink things...