It seems impossible you traded up a year, and to a dually for 600 bucks, but if that somehow happened, congrats to you!!
The back story is a little more complicated. I have purchased at least 20 vehicles from this dealership in the last 30 years. And I purchased my '23 Ram 3500 from them at the peak of supply line shortages, when new trucks just were not available. So, I paid $71K for that truck, which included a more inclusive warranty. From the first day of ownership with that truck I regretted buying the extra warranty, and thought I had wasted my money. And even though I thought I had paid too much, I had received thousands of dollars more for my 4 year old trade in at the time than I had paid for it brand new, so the overall value was at least reasonable. Those were some crazy times for vehicle pricing, both new and used.
When I saw the current incentives on new trucks I wondered if now would be a good time to switch to a dually, which I new I would want within the next year or so, because I will be changing from a Toy Hauler to a slide in camper. I checked dealer inventory and they had one just like my '23 Ram, but with duals. I called the salesman I always use and asked him to get me a price to trade my '23 for their '24 dually. He called me back a few hours later. They were going to give me $60K for mine. I told him $11K depreciation was a lot for a truck with only 5,000 miles on it. He then said that if it had been any other customer they would have only offered $56K. Then he asked if I wanted to transfer the extra warranty to the new truck, and I said NO. There was a credit on the unused warranty, which bought the trade in price of my truck to $62K. And with the incentives bringing down the price of the new truck to essentially the same price, by the time they added DOC fees, registration, license, tire recyling fee, etc, the OTD price difference was $609.05. There was no financing on the old truck, and no financing on the new truck, so it was just a write the check and its yours kind of deal.
So, ... if other people are thinking of buying a Ram truck in the near future, take a look at the current incentives.