Insurance renewal asks about racking layout, what documentation do they expect?

Our warehouse insurance is up for renewal and the new form has a whole section on racking and fire safety that the old one never had. It's asking about layout, spacing, whether the installation was certified, and honestly I don't have proper answers for most of it. We've had the racking for years and it was put up by a contractor who's long gone, so I'm not sure we have any paperwork at all. I don't want to guess on the form and then have a claim rejected later, that would be a nightmare. I've been looking into approved racking layouts for fire safety to understand what they're likely assessing, and it seems like documentation of the installation and the spacing really matters to insurers. Should I be getting someone out to survey it before I fill this in, or is that overkill? Anyone dealt with an insurer getting this picky, and what did they actually want from you?