well with me, I drive 55-60 until a semi passes me, then i follow them. If i just drive 60 and don't draft my truck downshifts going up hills. If i draft at 55-65 it doesn't downshift. And when drafting i will speed up using the same amount of throttle. I don't ride their back doors too close, usually a semi-trailer length. I feel it's safe. I have 3 seasons of circle track racing in my experience, and the front end only had a few bumps to it, and i drove hard in the division.
I think it's all about how comfortable you are behind them
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Randy
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