I don’t know if it’ll work on your generation of truck, but it’ll take a little while if it does. The problem on the 12th Gen trucks was that the BMS wasn’t allowing the charging system to sufficiently charge the battery (maybe because of short trips, I don’t remember), so it was legitimately turning the system off to save battery. After disconnecting the BMS, it took a few trips for the charging system to get the battery back up to full capacity, and that’s when the truck stopped turning everything off right after killing the ignition.
Also, on the 12th Gen trucks, there were sensors on both power leads from the battery. One was the BMS that was safe to unplug, but the other one had to stay connected. I’ve long forgotten what the “other one” was, if I ever knew at all.