BTW,
Roamly offers trip interruption coverage. The standard version of that appears to be $2000 (which should be included in the quote I posted earlier, but may not be itemized).
To be clear, trip interruption only kicks in due to accidents and other insured events; e.g. most mechanical failures/breakdowns would not trigger trip interruption coverage. (Perhaps one could use a credit card with trip insurance to pay for fuel, food, campgrounds, etc. during the trip and get some coverage that way?)
However, there is coverage for 'Pest' damage ($5000 default, $250 deductible), so if a rodent eats your wiring harness while camping, trip interruption should kick in.
Other comments - They also have:
coverage for 'personal effects' ($5000 default).
Roadside assistance
Towing endorsement ($2500 default)
Roof (for leaks?) ($5000 default, $250 deductible)
Vacation Liability ($10k default)
I bought the policy; stated value of $100k for now. As I complete my build, I will increase the limit and I may switch to agreed/appraised value.