You should do a search, this has been covered many times.
Since you are not an employee of theirs nor are you incorporated, Worker’s Comp is a moot point.
You will need General Liability for any damage you may cause as a contractor. If the person who hires you is sued due to damage on your behalf, they will come after you. Example: you scratch the floor in a boardroom, client sues the person who hired you (prime contractor), the prime will come after you as they don’t want their premium increased. You need to cover yourself.
If you have gear that leaves your premises, you need an Inland Marine policy to cover any damages that occur to your gear – it falls, you tip it over, etc. How are you “renting” the gear to your prime contractor? If you bring it, and you operate it, you are covering the gear. If someone knocks over your camera, that individual is liable for the damages. You have to stipulate with your prime if you bring gear and are not the chief operator, they should sign and provide insurance coverage to you.
I have an UltraFlex policy with Erie that wraps it all together. Covers the office gear, $30K of location gear, $2M of GenLiab and I just added a rider for $50K of rental gear coverage. The rider just made it easier to send a cover sheet to rental houses rather than creating an addendum each time I rented stuff.
You only want to cover what damages you cause. If someone breaks your stuff, they are liable. Example: Shooting an event in an auditorium contracted by the venue; the director walks back, trips over the camera and knocks it over. $3000 damage to the lens & sensor. I talk to the venue, they payed the claim and subsequently got paid from the director’s homeowners policy. The individual ultimately paid.
Steve

