for the moment best when you have more than one unic object is export in 3DS format from Moi
then explode the object exported one time in sketchup
so you will have each object from Moi as component named in Sketchup obj0, obj1, obj2 etc...
http://moi3d.com/forum/index.php?webtag=MOI&msg=7181.1
and see this post and following for "comparaison component / group " for optimum result of similars components / groups after import from any progrograms!
http://sketchucation.com/forums/viewtopic.php?f=323&t=29279&p=551830#p551830