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If your dd tune smokes a lot, and your tow tune feels like crud, I can't give you an honest guesstimation of how well it will perform with your other tunes. But, if you have gauges and can monitor your EOT, EGT, and TFT, then I think you'll be fine. Don't let any of those temps get stupid and you shouldn't have a problem. I know people that tow 14K on a 140 tune; regularly, and without issue. Drive like you're towing something, and pay attention to temps.
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776