There are at least two separate insurance issues here. Probably more...
One is your gear. For gear, ask for what is often called a floater policy. It moves with the gear. Good for diamond rings, guns, optics etc. Higher values items. Most any local insurance person can provide this coverage.
The second and very separate issue is insurance for the trip. Essentially insures your trip/guide fees. Like travel insurance you may buy for a cruise. Your local insurance person is unlikely to offer this coverage, but may.
If you are towing a trailer, bringing atv/utv/cycles, more insurance is needed to cover issues, theft, liability, collision, etc...