After researching this further...
Compared to the dinette table, the secondary pedestal table is about 1" higher.
The dinette table is also about 1" higher than an ergonomic level for using a laptop (compared to sitting at a desk).
The pedestal table post is a Springfield Marine 2-1/4" diameter by 29-1/4" long tapered post. They quote this as a 28" post (subtracting the amount of post that is in the floor mount).
Ideally, we'd like a 26" post (2 inches shorter than the stock post). Unfortunately, they only make 25" or 27" posts. So we're going to order both - and then use the post that places the pedestal table at the height that works best for use on the 24D's sofa and the rotated cab seats.
Springfield Marine doesn't sell directly to the public. They referred me to
Cascade Depot, who sells to consumers.
Here are the links for the
27" post and
25" post we ordered.