DTNA submitted a 573 Recall notice (11V-289) prior to the IR response date and therefore was granted permission to forgo submission of the IR response.Freightliner reported that Fontaine's TSB issued in March had resulted in the remedy of 55 percent of all subject vehicles with an additional 33% scheduled by the time of their 573 submission.Freightliner will issue another notification 1 July if 100% of the subject population is not remedied by that time.ODI is aware that the Ultra LT 5th wheel was also installed on several other OEM's vehicles.ODI will work with Fontaine and the manufacturers to ensure that the remaining vehicles are identified and remedied.