When executing a state on dom0, just replace qubesctl by salt-call -l debug to get more insight on what happen during the state execution.
It is better to limit this usage to the execution of a single state with state.sls.
As an example:
sudo qubesctl state.sls path.to.my.state test=Truewould become:
sudo salt-call -l debug state.sls path.to.my.state test=True