Front axle hub bearings and race service ability

[Chamberpains]

This doesn't negate checking the steer axle thoroughly with, as Rawze mentioned, a dial indicator. But also check your drive axle wheels the same as your steer. Drive wobbles can easily transfer into steering wobbles, especially at low speeds. And don't over look the KISS, Keep It Simple Stupid, method. Make sure your 5th wheel is greased. It will pop and stutter especially at low speeds if its dry.