No you don't need 4x4 to tow. it actually hurts the tow capacity. In 30+ years of towing campers, and boats. I have NEVER needed 4x4, and haven't been stuck, anywhere. even on wet grass. Which I don't understand how that happens, but folks complain about it so I guess it could happen. And you can't use 4x4 on the road any way.
However. IF you want 4x4 then get it. It's your money. and you are the only one you have to please. The only time you would need it is after you unhook, and go play in the sand or something. But running up, and down the road . Nah.