I believe my Big Inning came with 28.5" legs. I'm pretty sure that is correct.
Here's some handy info that may be of help. Posted by John Robertson on RGP some time ago.
"A simple estimate of if you have the correct legs is to measure the
height of the lock down bar from the floor. If the leg levelers are
closest to the bottom of the leg the height is 36" (more or less)"