Roamin' To and Fro

I suspect this title only works in US dialects, and possibly not all of them. I believe I pronounce “Roman” and “Roamin’” exactly the same way, although that’s probably a result of me mispronouncing the second syllable of one or the other.

Rules:
Normal Sudoku rules apply.
Cells separated by Roman numerals sum to the total expressed.

Estimated difficulty: 1 out of 5