I routinely use ozone for odor remediation. It is very popular for flood and fire restoration. In a trailer I suspect a small 1-3 gr/hr generator would be sufficient to develop a shock level for a few UNOCCUPIED hours, then ventilated prior to occupancy.
I use a much larger capacity unit in my house occasionally with the same occupancy precautions. Although these devices must be used with caution, the ozone rapidly dissipates into oxygen. There is an allowable exposure limit, but the limit is so low (and barely over the human nose detection threshold) that if I can smell it I don't breath it.