I'm in the same situation: dealer installed towing pkg, no cooler (well, no tranny cooler) and about to set off on a 1500 mile trip from Miami to Chicago with a 6x12 Uhaul. I just had the trans flushed at the dealer as a precaution, but wasn't planning on installing a cooler. I'm taking the lowland route thru northern FL and AL and so won't be crossing any major grades. Would also appreciate an opinion.
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