Vicki, remember because the pedestle table slides side-to-side, folks can get into the dinette. Because a hinge table doesn't move, it must be shorter (same width). Unless you want to crawl under! Anyone remember doing that as a kid?
Unless someone has purchased a 21' with a hinge table, You (we) may need to get the measurement from Escape Trailer Industries.
Honestly. If you're building a table to suit yourself... measure your hips and shorten the table, angle the edge to suit your needs... not someone else. Who says it's got to be "stock." Certainly not me.
Can't wait to see what you come up with!