I blew the tread off a tire on the interstate and it snapped the leaf and tore the brake lines off of my dual axle TT. I got super lucky on a Friday at 5:00 and found a place that had all the parts in stock and they fixed me up for cheap. I'm not sure if a torsion axle would have fared better but it was 'fixable'. Trailer tows fine down gravel roads. Since the leaf spring locates the axle you can't go far with a snapped spring, even if you have a spare. I limped 4 or 5 miles with the trailer dog trotting behind me on the still inflated but now treadless tire.
