I'll quote NDT owner "you won't break my tower. I wouldn't tow more than 3, assuming you installed it correctly"
I guess it depends on what tower you have and how well you put it in.
I'm pretty confident in mine as it was installed with incredible attention to durability. A cheaper tower with an average skilled install would not be recommended.
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When I was a child, I used to talk as a child, think as a child, reason as a child; when I became a man, I put aside childish things.
1 Corinthians Chapter 13 - 11