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I sell RV Parts online.  Our organization is called The ROUTE 66 RV Network, so we brand everything around ROUTE 66.  When we launched our store 2 years ago, we launched it with the domain: parts66.com We have a PR of 2, and we have been doing an SEO linkbuilding campaign ever since it has been around. Our primary keyword that we are trying to rank for is RV PARTS We also own the domain: rvparts66.com My question is: Is there a significant benefit to switching our URL to RVPARTS66.COM?  Does having our primary keyword a part of our URL give us an SEO benefit?  If so, what is the best way to keep any credit we have built for our original domain? We are in the process of a complete site overhaul which will launch in a couple weeks, so if there is ever a time to switch domains, the time is now. Thanks! jc