2.) It will also tell you if you enter your VIN on the left side of the page under the "Your Vehicle" tab, the third line down says Equipment listing. Click on Equipment Listing, then it will open a new window and you will enter your VIN # and it will show you all your options. https://www.ramtrucks.com/webselfservice/ram/index.html
3.) There should be a tag on the rear axle if you feel inclined to crawl under the truck.