You're in dually territory. As others have said, a camper with a slide is over 4000lbs...closer to 5K wet. We also have a boat that comes in at 5500lbs as well so I understand what you're going through.
As far as the new SD's go, they are nice rigs. I love mine and the ride is fine. 100x better than the truck it replaced. I went from a 2000 F350 CCLB dually to an F350 CCLB SRW with 4200lbs of payload. We briefly thought about a new slide in but decided against it and kept the popup FWC for the times we have boat with us and went with a trailer for the rest of the time.
Having a dually as a daily driver isn't that big of a deal but it can be a pain. I daily drove mine, then had a commuter rig, and now back to daily driving my f350.
