I have built a 41qt sideways. It has 4 41qts and 6 32qt. I have had no sagging. Its on wheels. I have one continuous piece of heat tape through it. It keeps all the tubes at one temp very well I run that rack and 3 others on my herpstat pro without problems. I am still trying to find pictures sorry new computer old hard drive crashed. Not sure if i have any pictures of it anymore will take new ones of i can't find any of the old ones.