I have never hooked to a 3400, But I do tow a 3685 with the front living room. And I was quite suprised as it didn't sag my single wheel F350. I was suspecting I would end up wnating to trade to a Dual wheel pick-up. But is really only squated it an inch and a half. Barely touches the overload springs. I guess if I was going to travel a lot and never stay longer than a couple weeks here and there I would probably go with the dual wheels, similar to the 3500. I guess it depends on what you plan to do with the truck other than tow with it. Mine gets used as a family hauler from time to time. If I was in your shoes I would go with the dually for the added insurance. One can never have too much truck.
ON EDIT: I was just unhooking from the trailer in these pictures below. Don't want you to think that is how it rides going down the road. I will try and get a better picture this weekend and repost it later.
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