I have about 8,000 miles on my 02 CTD and have only towed a 20 foot boat. I am gonna start towing a fifth wheel or a trailer with a car on it. I don't consider any of these heavy weights, but I would like to a transmit ion with a larger quantity oil pan. Any recommendations regarding larger pans. Are they being made, or what brand I should purchase? Any help would be great. Thanks.