Yep, you're right...the manual does say "corner latch". My dealer referred to them as "stabilizer bars".
However the manual (2002 edition) no longer refers to stabilizers...they're now referred to as scissor jacks; and the manual clearly states "use the rear scissor jack on the low side to level the trailer side-to-side" (page 12).
Yeah, I know you are in the "these are only stablizers" camp...and I'm just as strongly in the "these are really leveling jacks" camp. But the manual is clearly instructing owners of newer TMs to use them as leveling jacks, leastwise for side to side leveling. And I'm personally assuming the TM engineers either wrote or approved that section of the newer manuals and if it's good enough for them, it's good enough for me.
And where the heck is Happy...we need to get the Pocket Stop Expert in here!