Torts — Automobile accident — Leased vehicles — Short-term rental — Vicarious liability — Automobile dealership’s liability for accident involving vehicle owned by dealership and driven by its employee — Trial court properly entered final summary judgment in favor of dealership based on federal Graves Amendment where dealership established that it was engaged in trade or business of renting or leasing vehicles, plaintiff neither alleged nor proved any negligence or criminal wrongdoing on part of dealership, and vehicle was a short-term rental vehicle provided to employee in employee’s capacity as a customer while his car was undergoing service at the dealership — Because Graves Amendment does not require written rental agreement, dispute over existence of valid pre-accident rental agreement was not material to legal liability issue