Hi, We have an 07 Diplomat 40 SKQ and it's a great floorplan. I removed the love seat and built an extension for the slide floor and installed a rocker recliner in it's place, that worked out great for me because I have to have my recliner (spoiled brat that I am). It does not have IFS but does have the 8 bag RR8R suspension. Mine rides great, plenty of power with a 400 Cummins (ISL). If it doesn't have the 400 Cummins I'd ask for more opinions from those who know what you should expect from a smaller ISC engine. Good luck, and Happy Campin!
Tom & Kathy D.
2007 Monaco Diplomat 40 SKQ