One thing that helped me was documenting everything thoroughly. I took detailed photos of my mods and kept a folder with all receipts and installation details. When I had to file a claim, having that evidence really helped argue for the value of my custom upgrades.
It might also be worth looking into “agreed value” policies if you haven’t already. Some insurance companies offer this option, where you and the insurer agree on the value of your vehicle beforehand, including any modifications.
Also, keep in mind that having a good plan for other types of coverage, like
life insurance, can also provide peace of mind and help with overall financial planning. If you need more specific advice, consulting with an insurance expert who understands custom vehicles might be beneficial.