The truck company's insurance division called and informed me that Massachusetts has a minimum of $5k property damage coverage which is included with the rental (first I have heard of this even after talking with several other company reps). This should cover at least part of it. So that is good news.
I'm sure they don't advertise this. They want you to buy their insurance. Of course, $5K can be a drop in the bucket, so I still recommend getting the additional coverage when renting a truck. People are used to driving cars. They tend to misjudge the size of the truck and get into a lot of minor scrapes. Just to easy to have that 'oops' when driving a different class of vehicle.
Dan
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Checked on the credit cards... sadly they all exclude any type of truck. They also exclude larger SUV's and van's as well (FYI for anyone reading).
I figured it was a longshot..... but it was worth checking.