I have a Grand Cherokee, but I have a 2417, which is at least 6" narrower than your TM. I could not see directly behind the trailer with the GC mirrors, so I installed a rear-facing camera on the rear bumper of my TM. I can now see anything directly behind me, and can tell when I am far enough in front of a vehicle in the next lane to make a lane change. There are no blind spots between the camera (170° view) and my mirror field-of-view.
I would not tow without extended mirrors or a camera. If I got a larger TM, I would go with mirror extensions and the camera. I can just sight-down the sides of my TM with my mirrors, so I know a wider TM would obscure even more view. Even with extended mirrors, though, I don't know that you would be able to see a smaller vehicle directly behind you, and within 20 feet of your bumper. I can't say for sure, as I don't have the wider TM models, but I wouldn't want to be unable to see someone behind me.
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