In addition to the safety items listed in the two previous posts, Even with an aux transmission cooler you are really stressing the transmission and setting yourself up for early trans failure. I certainly would not tow a TM with a 3500 lb rated vehicle, but if I did , I would want a transmission temp gauge to confirm that. I tow a 2720SLwith a Silverado 2500 HD ( with trans temp gauge & 12000 lb tow rating) and there is a noticeable temp difference in trans temp when towing in hills and mountains.
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