you try anything in a 265/60/18? iirc there were a few options in that size, and i think they should be ok on a 9" rim... i think i looked at the goodyear wrangler silent armor in that size as well as the bridgestone dueler APT (not as agressive as an A/T but still deep tread and fairly large voids)

why not go just a hair bigger to a 285/60/18 nitto terra grappler or cooper zeon LTZ... both have great reviews here