I have the same setup on my 2018 ACE 29.4. What issues are you having with the lock? Only thing I have noticed about ours is definitely wants the coach to be relatively level. Any torque in the setup and its gets a bit sticky.
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Bud & Maria
2018 Thor ACE 29.4
2020 Jeep JLU Rubicon
(swapped out of 37' 5th wheel and Chevy 3500 DRW Duramax in Apr 18)
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