Congrats and welcome to RF! I just recently purchase a 2022 ram Laramie 3500 it's a CCLB my payload is 4055lbs and my towing is 20,055lbs, you are going to get a lot of answer here so get ready, as far as that 5th wheel, if you don't load it up to the full 16500lbs you will be okay, and I say that lightly because you will be surprise of the stuff you load up in these rv's.
A SRW people like to say that you can go up to 15,000lbs but after that a dually will come into play, so it's really on what do you feel comfortable with, are you comfortable with that setup. Some people are hard knots that you much have a dually to tow that and some will say that if you don't load it up to full captivity, so get ready for those to come chime in.
My 5th wheel is 37" with a total weight of 13,000lbs, which I haven't been to the scale again yet but I know that I'm good with that weight so I'm not worrying about that. When you get up to 16,500lbs you will be better off on getting a dually it's so much better towing that kind of weight with a dually. The best thing to do if you are committed is once you do get it is to go to the scale and get it weighted you might find out that you are okay.
So what kind of 5th wheel are you buying? You always don't go by the unloaded weight but the gwr of the 5th wheel and 20% of 16,500 is 3,500lbs but it will usually will be more like 3700lbs to 3900lbs if you don't overload it, so continue with you search.
We see it all the time, people towing 5th wheel that should be towing with a dually all the time but they do it, it can tow it but having a dually with that kind of weight is so much stable.