Most major insurers will offer policies called "inland marine" or something like that that cover business equipment. For instance, I use State Farm for my auto insurance (Because I live in Illinois) and I have an additional business policy that covers me for $10,000 in gear against anything, and this includes rental gear. It's $26 a month. It also extends to any equipment I claim as necessary in the course of business, so that's computers, laptops, memory cards, tripods, lenses, camera, bags, cables, flash heads, you name it.
If you have an agent or a 1-800 number call them and tell them your situation. It's likely they have a policy option to cover you, and you might be eligible for discounts if you buy with your homeowner's / auto etc.