I am not an expert to characters, but it seems that those units get animated via .rtm's only (the model.cfg includes not animations, as far as I have analyzed this).
So you may check the animations, using a rtm-file (e.g. ca/wheeled/data/anim/xxx.rtm) an load this into O2 (Animations window) for all LODs (right click into the animations window pos up a menu).
plus: Have you checked the model.cfg for a correct bone structure and the assignment to the .p3d's name.
e.g.:
class CfgModels
{
class Default;
...
class ArmaMan : Default
{
sections[] =
{
"osobnost","Head_Injury","Body_Injury","l_leg_injury","l_arm_injury","r_arm_injury","r_leg_injury",
"clan"
};
skeletonName = "OFP2_ManSkeleton";
};
class SL_medic: ArmaMan {};