I found an old country road near me...get up to 40 mph then using only the hitch manually, set the trailer brake until it slows your TV down to 25....drive another mile or so...do the same thing...repeat about a dozen times or so...it will set your brakes and is the recommended method from Lippert. Mine is set at about 2.3 I believe.
Hope this helps,
Jim & Linda Tator
2013 Crusier CF34SS GMC 3500 8.1L Dually
154 nights in 2013 - 4,370 miles
178 nights in 2014 - 5,082 miles
365 nights in 2015 - 6,040 miles