For a high-hesitation product, I would make the buying risks explicit rather than rely on a generic trust badge. Your emphasis on warranty, installation and local support gives shoppers information they can actually use.
On each product page, clarify compatibility, what is included, who installs it, delivery coverage, warranty exclusions and the steps for a faulty item. Keep those details consistent through the cart and order confirmation. For technical fit questions, offer a clear way to check suitability before purchase.
Use genuine reviews with permission and avoid simulated purchase activity. A social-proof tool should support accurate information, not substitute for it.
To evaluate a change, track the questions customers ask, cancellations, returns and completed purchases alongside conversion rate. Those measures help distinguish better-informed customers from a short-term lift that creates later problems.
Which pre-purchase question still appears most often in your support conversations?