We have a 2022 Ram 3500 Longhorn Ltd Edition 4x4. It is recommended at 67500 miles to lubricate driveshaft fitting. I took it to a local dealer where we are workamping (camp hosting) to get the recommended tranny, front/rear differential service, brake fluid service, rotate tires and lubricate driveshaft. They didn’t rotate tires. When questioned on it was told diesel mechanic was away on training. I said it is just a rotate (explained it since not like other vehicles given it is DW). He said to down road to tire place. But on scanning paper work before putting in glovebox, noticed that they didn’t lubricate driveshaft. I have read online that there is not fitting for lubricating driveshaft on some Rams. We need help on if there is a fitting and where located. We have the tools needed to do it. TIA for any information you provide. We are new to owning such a big truck and diesel.