Andy,
Sorry to hear about your loss. You may wish to ask your insurance agent if you can purchase an all loss (not sure if these are the correct words) rider to cover your photographic gear. I have State Farm home owners insurance and have such a rider. They have one rate for people who do not use their gear commercially and another for those who do. They have replaced cameras and lenses that I have simply dropped and broken. I've never had any stolen. Keep in mind that they have the option to repair or replace, and that if your camera or lens is no longer in production, you may have to convince them that item x is a more appropriate replacement than item y.
This isn't meant to be a State Farm advertisement, as I suspect that other agencies have comparable policies. I would expect to pay 2-4% per year. If you can't afford to replace all or a significant portion of your gear in the event that it is stolen or lost, this is a small price to pay.
By the way, do the trip, cameras or not. You never know when something will make such a trip impossible for you.
Best of luck,
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