I was under the impression the LastStop field would need to be something like this:
laststop: DLookUp("[StopCity]&', '& [StopState] &' '& [StopZipCode]","StopT","[StopID]=" & DLookUp("[StopID_FK]","LoadStopT","[StopOrder]=" & DMax("[StopOrder]","LoadStopT","[LoadID_FK]=" & [LoadID])))
but it...