My contact at SuperSprings International who makes the Sumo Springs was Gerry Lamberti (CEO) 505 Maple Avenue, Carpinteria, CA 93013 Phone: 805-745-5553. He was extremely helpful as we had an exchange of emails and live conversations. The Part Numbers: for front SSF-184-40-1 and for rear SSR-184-40-1. In the right rear a 2" vertical square tube welded to the frame interfered with the location of the Sumo Spring upper bracket. Gerry recommended to go with a Blue 7" spring rather than the Blue 8" which comes with the kit. All the installation brackets are the same but the upper brackets in the rear are mounted approximately one inch lower therefore the shorter blue spring. I highly encourage you to talk to Gerry if possible because they are always doing additional development and may spec a slightly different spring since it has been almost one year. The following photos show the original installation diagram which the interference point on the right hand rear on FR 30DS doesn't allow, and our actual installation with the new lower position of the upper Sumo Spring bracket and shorter 7" Blue Sumo Spring. Before installing the Sumo Springs, I had added a Henderson rear trac bar that required a minor trimming of a gusset which Sumo Springs and Henderson talked and said it would not affects the function of the rear trac bar. No modifications required to install the front Sumo Springs. I had Camping World do all four suspension improvements but I did the research and interaction with Gerry at SuperSprings International.
. You will want to do a visual check to make sure you will have that same interference point on the right rear since I'm sure Forest River makes running changes. I hope I haven't confused you too much and please free to ask for additional information.
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