The deal is, it doesn't matter about the trucks. Think of the whole system as an upside down peace symbol. Once you get that, it's not so confusing. Big circle. You do not leave ATL accidentally. The worst you would do is miss I-20, and even if you did, you can come right back up the perimeter from the bottom and go there just the same.
Even if the trucks confined themselves to the perimeter (which they pretty much don't) They are either ON the perimeter, or you are trying to pass THROUGH the perimeter where they are - twice. So you do not escape them during rush hour, ever.
I rolled up and down 85 daily for years, usually 7 days a week, working downtown for part of it. If I can do it thousands of times, you can certainly do it now and then. True, it's not much fun on a daily basis. But as an occasional thing? Meh. Go right ahead! You oughta see it on a NASCAR weekend. More toyhaulers than you can see around, that's for sure.
I will give ATL credit for one thing - they really are generally very good about confining road work to off hours and not making it any worse if it can be helped. In a city full of so many trucks, they tend to be reasonable about not making lanes too narrow with those concrete barriers, as I have observed in other places.