As far as the trigger bar10 goes, and the rack tilting down, it is made to be very tight. So yes, the spring helps, but it does not set the release bar (11) in place. You must wiggle the rack up and down and push the trigger in to completely seat the release bar (11)
See section 4.0 – Usage in the manual – HERE
1- When moving rack between positions, ensure the release bar11 is seated so that the trigger bar10 is flush with two cross bars12 /13 for vertical position and for standard carry position (Figure 14).
2- You MUST wiggle the rack up and down, and push the trigger bar10 in to fully seat the release bar11.