I stand by my first post on page #2. Settle on your 5er first, you are looking at 32’ to 34’. In the 10,500# to 11,500# GVWR, our 32’ has a GVWR of 12,360#, I feel it is well built but still some light weight materials.
Find the 5er you really want, then let it decide what And how much TV you need. My DD now is the proud owner of a 2004 Ram 3500 CTD DRW for towing her 30’ four horse with living quarters GN trailer GVWR of just over 12,000#, but will be pin heavy. Yes a new Ram 3500 SRW can have 200# more GVWR, but she was not going to put out that much, this one only has 130K miles.