Towing a 2022 Lance 24 ft travel trailer with our 2021 GMC Sierra 2500HD, gas. Loaded, trailer is about 6,000 lb. We get up to 10 mpg at 55 mpg, such as I-5. Pleased with the combination.
On our 2015 Siverado, we had a truck camper, so I bought the same camera installed in the tailgate, and installed at rear of camper, and could view image on screen. I think it would be a challenge extending the wires to the rear of your travel trailer. It would also be necessary to crawl underneath truck to hook and unhook camera.