I know all these threads just got revived but since I never saw them the first time:
I have USAA, they did not care that I was offroading and at my own negligence ran into a tree.

I paid my deductible and that was that. Ended up getting a new bed, welded, painted, mounted, new wiring, new lights, replaced my custom rear bumper, the whole shebang. Just my standard regular auto policy.
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Yes, you can get coverage for your modifications while staying with USAA, but there are limits. USAA typically offers up to $5,000 in coverage for aftermarket parts through a Custom Parts and Equipment (CPE) add-on. Many insurance companies, whether for two-wheeler insurance or four-wheeler insurance, allow you to add this type of coverage for things like bumpers, lights, winches, and bed caps. You can also check customer experiences with providers like Allstate at
https://allstate.pissedconsumer.com/customer-service.html. You'll need to provide receipts and photos of each modification to get them covered.
If USAA doesn’t offer it, you could look into getting a separate policy just for your mods through another company that specializes in
four-wheeler insurance and vehicle customizations. This way, you can keep your main policy with USAA and still protect your modifications. Just make sure the other company works well with USAA.