You can try the command
and then use the "lsmod" command to see if it appears loaded. If there are any error messages then probably not. You can look in the /etc/rc.d/rc.inet1 script for an example of bringing up the interface and the gateway route, etc.
I think if you create the script /etc/rc.d/rc.netdevice to load the module and then set the execute bits, the system will load the module before calling the rc.inet1 script.