Given the limited towing capability, it's unlikely that any of us would be pulling anything that needs mirror extensions. Are you taking EVERYTHING out of the travel trailer?
Pulled this U-Haul close to a thousand miles round trip and thought the mirrors were fine. You can definitely see a lot with the regular mirrors. Wider and taller than the bronco too
If you don't have blind spot alert, you get spotter mirrors. Not quite as good as extendable tow mirrors but I have no problem seeing around medium-size trailers with them.
I’ve used something like the Camco Tow-N-See mirror extensions for years and move them to different vehicles as needed. They attach via suction cup to the existing mirrors. You can use them on your Bronco, Dump Truck, F-150, and Golf Cart.