Agreed on the American Family policy, btw, your agent has errors and omissions coverage similar to a lawyer or Accoutant, you could always go that route if AM FAM denies your claim. That's poor customer service, but not all that unheard of if you are with a "captive agent". (works for the company).
Also agreed on the underinsured/uninsured motorist coverage, although that covers only bodily injury and not property damage, which was the intent of my post. A better way to go is to see if your company will extend those coverages under your umbrella. Higher limits are available under the umbrella, and often times it's more economical.