Found a solution to avoid having to install MOOSE.

Now MOOSE can be copied into the mission file, but you'll need to
include a "do file" action of moose.lua in the mission file and copy the
rest of the MOOSE files to the MIZ file.

Moose/SlingLoadHookTask.lua

@@ -0,0 +1,39 @@
+--- A SLINGLOADHOOKTASK will orchestrate the sling-load hook activity to slingload a CARGO from a specific landing zone(s).
+-- @classmod SLINGLOADHOOKTASK
+
+Include.File("Task")
+
+SLINGLOADHOOKTASK = {
+  ClassName = "SLINGLOADHOOKTASK",
+  GoalVerb = "Hook and Sling Cargo"
+}
+
+--- Creates a new SLINGLOADHOOKTASK.
+-- @tparam table{string,...}|string LandingZones Table or name of the zone(s) where Cargo is to be loaded.
+-- @tparam table{string,...)|string CargoPrefixes is the name or prefix of the name of the Cargo objects defined within the DCS ME.
+-- @treturn SLINGLOADHOOKTASK
+function SLINGLOADHOOKTASK:New( LandingZones, CargoPrefixes )
+trace.f(self.ClassName)
+
+    local self = BASE:Inherit( self, TASK:New() )
+
+	self.Name = 'Hook and Sling Cargo'
+	self.TaskBriefing = "Task: Hook"
+	
+	if type( LandingZones ) == "table" then
+		self.LandingZones = LandingZones
+	else
+		self.LandingZones = { LandingZones }
+	end
+
+	if type( CargoPrefixes ) == "table" then
+		self.CargoPrefixes = CargoPrefixes
+	else
+		self.CargoPrefixes = { CargoPrefixes }
+	end
+
+	self.Stages = { STAGEBRIEF:New(), STAGESTART:New(), STAGEROUTE:New(), STAGE_SLINGLOAD_HOOK:New(), STAGEDONE:New() }
+	self:SetStage( 1 )
+  
+	return self
+end