Compare the NLifeboat_02 and the Rescue_Raft in the Sea folder. Rescue_Raft has different passengers (their nodes on the raft were moved), and the UnitType= was changed to 106. One important point to remember though is that "Type106=Rescue Target" in the Names.cfg file, and that the game uses ~ALL~ Type=106 to pull its assets for downed airplanes from, so ~ALL~ nations have to have one in their Roster - which you might not want... We removed Rescue_Raft02 from FotRSU due to Rostering issues...
