You must have alot of towing experience to form this opinion so strongly......Makes me wonder why you have to ask the audience then.
Personally I would have zero issue flat towing a half ton truck with a 4500chassis with a 6 liter.
May pull from your quiver of weapons against the hubby (poor guy) that a flat or dolly tow will add almost zero tongue weight, so while it may be a bit above the "rated" tow rating, any class 3 or better hitch will flat tow a pickup just fine.
Yes you may have to yank the driveshaft or whatever. Depends on the vehicle.
Or he could send you home on a plane and tow it by himself....