You bet. Are you able to test the output of the "Make Table View" (i.e. the last 4 bubbles in the model) outside of Model Builder in ArcMap? You may be able to work out whatever kink is causing the final output to be empty. The "Freight Rate" field calculator should work as long as it has the required inputs and the inputs are the right data type for the calculation.
What data does the "CF_Routes_CopyFeatures_View" have? Does it have all the variables needed to run the calculation? If not, you may need to add the table with the information as an extra input and attach it to the Field Calculation.
YouTube has some good tutorials on how to apply inline variable substitution (check this 4 minute out: https://www.youtube.com/watch?v=DKIOXEIXoGI
Cheers,
Mike