Kingman's claim to fame is being on "Route 66". There's several "Route 66" attractions in Kingman. You could easily make a loop including both stops. I'd recommend taking the freeway to Kingman then following Rt 66 down thru Oatman. After Oatman, come on down towards the river and down thru Bullhead City which is right across teh river from Laughlin.
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Jeff