Back to the renting part... Sunbelt may work with you, but as mentioned above they don't normally do larger equipment without an account. They may require a 1million dollar insurance policy. I've heard Sunbelt doing that with skid steers/mini excavators rentals.
And to be redundant again, call your Utilities Locate ... and I don't care if your in the city, suburb, or out in the country. I've worked in enough yards and fields where wires were laid, or gas lines, etc...