This is a good topic.
I had a budget on my short film of $10K, and spent every dime even though:
1. Equipment and insurance for same were provided by my film school.
2. All production items and people were covered by the school, *provided I got the paperwork done in time.
To cover my show cars it was too late for the school paperwork, and before putting the show cars under my own personal auto insurance, I called around and found a company willing to cover the production for $5K for *one week. That's 1/2 my budget and sounds way out of reach for most productions.
Sounds like a pretty good deal for the insurance companies, but some productions do a lot of SFX, stunt-work, etc., and really should have insurance.
What are small productions to do? Forget the insurance and cross their fingers?
What have others done to provide no- or low-cost coverage?