Welcome @William E Simon !
We have a section dedicated to that topic here: https://www.ecodieselram.com/forum/forums/ecodiesel-settlement-information.36/
Feel free to browse the forums, we've got a great group of folks here!
Fair enough.. If you're towing a boat or trailer every now and then, I still feel like it'll get the job done as long your going across town to your nearest campsite/lake. If your a full time RV'er, then get a 2500 with a bigger diesel.
Some configs can tow 9200 pds. We're talking about half of that... also, I never towed that heavy but I never had a problem and didn't feel anywhere like the truck was struggling with 4K pds.