I made my own and it works fine. I plug it into the suitcase solar panel controller which provides a convenient place to plug in the Starlink mini. The power wiring between the 7 pin connector and the battery is 10 AWG. 2023 400.
It will work as an easy, less efficient alternative to buying a panel without an onboard controller and adding a solar port so that you can mount the controller close to the battery.
Stockton, New Jersey 2020 nuCamp T@B 320S * Jeep Wrangler 60,865 camping miles through the end of 2025
This sort of thing was brought up in the Forums back in 2018, with the "Anyone Carry a Spare Battery" thread. I still have mine that I can use with my portable solar panel. With the proper adapters, you can plug a "spare" battery into the 7 pin and power the trailer if you wanted. (With the trailer battery switch off). I still have mine and use it from time to time. The threads and comments below show the original idea.
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2021 F150 2.7l
2020 nuCamp T@B 320S * Jeep Wrangler
60,865 camping miles through the end of 2025