A type of policy called "inland marine" would do this. It's a strange name, and a carry-over from many years ago, but I believe most insurance companies still offer it. I use an inland marine policy to insure all my photographic gear and related electronics, whether at home or on location, or travelling. I did have to use it once, and it replaced a camera for me with no hassle. I've got a $100 deductible on mine, and the premium varies depending on how much coverage you buy, but it's relatively inexpensive.