Oil Cooler for towing

Michael, hope you get this...i tow a 5000 lb. travel trailer and even with a fan forced perma-cool trans cooler the temps start climbing when i hit the usual 6 % grade where i go...highest i've seen with cooling has been about 220 degrees...and with increased trans temps the water temp starts going up...i have now installed a perma-cool pusher fan in front of the other half of the radiater...it is new so can't tell you how well it is going to work...i have both switched so both come on at the same time....you can do an on-line search for "trans. temps"...it is scary how fast fluid goes bad at higher temps...i try to keep mine as low as possible...do not believe winter temps cool it too much...my vote? do it....