Insurance companies' policy terms differ as do internal guidelines of individual insurance providers but in general damage to your truck from having a tire blow out would be a covered under your Comprehensive coverage.
Normally when an automobile part, such as a tire, causes an accident or damage to a vehicle a Comprehensive policy would cover damages that resulted from the incident but not necessarily the replacement cost of tire.
A tire blowout would be considered a covered accident typically if the blow out caused your truck to be damaged not though if it is just the tire that suffered damage. If it was the latter then it probably would not be considered a covered insurance event. It would also depend upon the terms of your insurance policy and your insurer's internal guidelines.
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The terms of insurance policies differ but in many cases blowouts or tire/rim damage that is not caused by theft or vandalism or is not a result of a vehicle collision causing tire or rim damage are not covered.
[Let CarInsurance.com help you find affordable auto insurance now.] If you recently had a tire blow out on your truck causing it to be damaged than check with your insurance agent to make certain that this incident and resulting damage would be covered by your car insurance policy. | 
