http://rahal.com/indy-news/united-rentals-renews-agreement-with-rahal-letterman-lanigan-racing-multi-year-agreement-includes-primary-sponsorship-for-graham-rahals-entry-at-phoenix-as-well-as-the-duals-in-detroit/ United RentalがRLLと複数年契約 フェニックスとデトロイトではプライマリースポンサーに