For what you described your intended use will be, I suggest you give deep thought to a Dually. Buzzcut1 has many miles with a big TC and towing with the SRW 3500. His mods were typical for the load.
For over 12 years I hauled my 4200 lb non slide 11.5 ft TC, no basement, on my SRW Dodge 2500 2WD. Using 4 foot extension, I flat towed my Samurai. It required lots of mods and 19.5s before the truck handled well.
A trailer instead of flat tow would have been too much. A TC with a slide would have been too much. A TC with a basement would have also compromised stability.
For more creature comfort, last year I bought a '04 Dodge 4WD Quad Cab 3500. I added a sway bar only, and as pleased as I am with the way my SRW carried my TC, hands down the DRW is without question much better. This is with stock tires. If you are a door sticker fan, my weight is about 500 lbs under the sticker. My '04 is my new toy, and as such I have added airbags and a Curt hitch I would only use if I ever decide to pull a trailer with a 3 or 4 foot extension. I do have a 19' 5th wheel.
Using a dually as a daily driver is a personal thing. For 5 years, I drove my SRW with the 11.5 ft x 8 ft wide TC (same width as dually) as my daily driver. Most of my driving was in the bay area. I certainly did not drive it the way I drive my Samurai, but I never had a problem even in shopping centers. For your intended use, I would definitely go with a Dually. If you don't, it will not take you long to realize you should have. If you are concerned the ride would be too harsh, don't be. My '04 Dodge 4x4 Dually is as smooth as any vehicle I have ever owned, and my bet other makes are just as smooth. You need to do a test drive.
