This is the main factor in my opinion. Aux Trans coolers are added when excess towing is going to be a part of the vehicles' regular use, but if you don't think you'll be doing any, there's really no need for one...not there really ever should be anyway given the extensive testing under extreme conditions the Vehicross went through before going to production. And it might be different if you lived in the southwest where all driving would be occurring in higher relative temperatures, but since you're in OH, maybe not so much.