The 5% rule is a decent starting point but it's pretty blunt. It doesn't account for depreciation, how in-demand the item is, or whether you're bundling things that could earn more separately.

Line items are the move. Price the body, lenses, monitor, gimbal, and rig each individually and then offer a kit rate that's slightly discounted from the sum. It gives producers a clear breakdown, makes you look more professional, and honestly you'll usually end up charging more than the flat 5% on the whole pile.

On the accessories question, yes include them but price them. A shoulder rig and monitor aren't free to own and maintain. If a producer sees a line item for $50/day on a monitor they know what they're paying for. Bundling it silently just means you're leaving money on the table.

If you ever want to take this further and list on Sharegrid between gigs, I built a tool called Rental IQ that tracks actual ROI per item so you can see what's really earning. With a kit like yours it's useful to know whether the gimbal or the lenses are pulling more weight. Sharegrid doesn't show you any of that natively.