That usually occurs for me when the model has no collision mesh associated with it. You can easily remove it by finding out what its name or ID is, then using the current elements list to delete it or you can manually remove the line corresponding with it from the .map file or
http://www.thegtaplace.com/downloads/f4580-rim-pack
I manually installed the rim mods without SAMI, and like the OP they were working fine in MTA 1.0 and 1.1
I'm using...
<client_file name="data/maps/veh_mods/veh_mods.ide" verify="0" />
And it returning ERROR: Unknown client_file 'data/maps/veh_mods/veh_mods.ide' When the server starts, any idea on how to get this working?