I'm no expert on custom tuning but I'd imagine there are some major differences in regards to TC locking and shift firmness that would be a substantial change from performance to towing tunes. If it's any help, I towed my trailer at about 7800# this last weekend on a canned Evo 87 tow tune and it handled a 3 mile very, very steep grade pretty well. TFT hit around 208, which is on the hotter side but it was around a 10% uphill grade at around 15mph on a windy mountain road. I'm hoping that once I get mine upgraded and custom tuned it will be even better. Case in point, canned tune isn't perfect but it will get you by until you can have a custom one written for you.
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