We do not have plans for any new designs at present. We have eight models and it is all we can do to keep those in stock.
Acronym Dictionary? Don't you mean an AD?
"Ask not what your country can do for you, ask what you can do in the country when you happen upon two trees spaced 15 feet apart." (John F. Kennedy's neighbor Jim)
The longer length allows for a more diagonal sleeping position. For a wee bit more weight, those extra 8" can add a lot to comfort.