If the shoulder is kept reasonably clean, I would do it. Shoulders in Louisiana get "cleaned" by the wind created by passing vehicles and rain storms. So I would have to add some Marathon Plus tires or something puncture resistant. Are there rumbles strips? Our highways have rumble strips placed EXACTLY where wind from passing cars do the best job of cleaning the shoulder 18"-24" outside the fog line. At least the rumble strips let me know if someone drifted over behind me while looking at their phone or plucking their eyebrows.