Tubs

(or indeed go Clincher, have a set of old clincher rims fitted to the 600 hubs they did have them those days)

Clinchers are more fault prone on such roads. All the pot holes are just the thing to get pinch flats. Sharp stones.. they'll cut through what they'll cut through so one wants a heavier duty tyre.. That's what all the Paris-Roubaix tyres are about.