I found that most tours will be a driver-only experience with lunch, winery, etc. included, so went to the museum's website and found a link to Artetruria and sent a request. A prompt reply said we could arrange a private tour of tombs (some not open to public) and museum, for 120 euros. Seems much more like what we need. We will drive to Tarquinia and meet the guide there. Has anyone used this service?