I’m interested in peoples thoughts on choosing the light or heavy setting for the trailer brake. The manual suggest light for under 10,000 and heavy for over 10,000. I tow an Airstream rated at 9700 (empty) with electric brakes. Currently, I am using the light setting with a gain of 8.5 - 9. Does anybody have experience with both light and heavy for a trailer weighing approximately 10,000.