I started to make this like another normal mod, but when I exported the first time, the game crashed, without any errors in game.log.
Then I tried to import the same trailer, and this happened. It's like I attached all the pieces together, turning into only one piece.

Only when I mark "Merge Models" this don't happen.
The only error in Zmodeler when I import the pmd is "This model requires skeleton and bones weighting but was loaded sliced by bones ID."
How can I solve it?
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Printscreen: http://i.imgur.com/RUBqSaW.png?1