My experience with dodge and ford trucks towing heavily loaded trailers on a daily basis
Ford F250/F350 diesel/Auto trans: All 14 purchased with over 225,000 miles and all maint. records. Every truck had an auto. trans. replaced between 160,000 and 200,000. No trans. troubles after that, through 330,000 miles, so far.
Dodge 2500 diesel/auto trans: Three, purchased brand new. Every trans. cratered at less than 75,000 miles. Got rid of all of them before 100,000, so no history after that.