I have a question regarding the use of tow mode and the gear lock out. I have a 2019 4x4 with 3.55 gears and the Ecodiesel. I tow a camper that is just under 7000#.Should I lock out 8th gear or just let the tow mode do it's own thing. I want to travel into the mountains of the Carolinas on my way to New York from Florida to see my family. Any input would be appreciated. Thanks.