I found majority of newer Forest River coaches use a Lippert 1621. Personally and what I recommend to friends is skip the Morryde and go right for the airride. I have a source for the Trailair 1621 pinbox for less than 800. I was lucky and found one on Craigslist once and picked it up for 125 but I did drive 200 miles round trip to get it. Well worth it.
But if the Morryde is priced right go for it. Nothing wrong with used. Lets face it most people are not wearing them out. You can always resell it.
*Current: 2005 Ford F350 Crew Cab Dually 6.0 diesel 4x4*
*Retired: 1987 F350 Crew Cab Dually 6.9 turbo diesel
2007 Forest River WildCat 32QBBS