If you find the task is failing on 3.6 RSA with drivers. Try this.
Make a new postinstall task using Runtime Environment:
Then upload copy_drivers.vbs from the peinst/hta/ folder call it
cscript.exe copy_drivers.vbs save it
Add to the mid leve task.
Check drivers are synced under the rsa share \\rsa\peinst
Make sure is checked and save sync