I HAVE a 2005 tm 3023 ,pulled by 2005 chevy crew cab 5.3 v8 avg. 17.2-17.3 mpg. while pulling. i had the same problem, called ed at tm and ordered two nylon turn knobs,replaced the 1st one with silicone in the hole and a larger screw. put 2nd one above it equal distance between top of door with silicone and larger screw.works great !
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