You can open the modDesc.xml file thru winzip or winrar and fix the modDesc.xml by replacing the dependency at the bottom with this:
<dependencies>
<dependency>
<modName>emergencyPack</modName>
<minVersion>1.0</minVersion>
</dependency>
</dependencies>
Or you can open the modDesc.xml file thru winzip or winrar and delete these lines:
<dependencies>
<dependency>pdlc_emergencyPack</dependency>
</dependencies>
Only delete these lines and it will show up. I have all the DLC's and had the same issue. Game says it needs emergency pack when it's installed. Using either method will allow the vehicle to show up in game and fix the server issue of missing the dlc when it's installed