My racks are 10 foot wide by 6 foot high and they are usually ok even at that height but I throw small pieces in between the stacks and sometimes that will push out the top of the end stack and topple it. You can see my racks in my avatar, that was at the old house and they were on a grade and they toppled all the time especially when the frost came out but now I’m on flat ground so the stacks are much more stable.
