The difference between dry and actual weight could be 1000 lbs or more especially if you add people water etc, or pull a trailer at all.
If you go with a RAM make sure it isn’t the coil spring version. Reports here say it’s really bad for a load.
I agree that you’ll likely need the 350/3500 to stay under GVWR. However, there are small differences between 250 and 350 models, so actual capability may be only slightly different. 250s can come with lesser rated tires and that would likely be the biggest difference. If you are going used, that’s one thing to make sure of. People do replace tires with ones that are rated less, and that can be an issue.
Most will say drive the truck with the TC and see what you think before adding air bags etc.
Have fun!
