userosker727, I realize this post is a few months old but I wanted to chime in for your and other's sake who may find this thread. Right now there is not a good, straightforward way to track "rental" inventory directly within QuickBooks online or QuickBooks desktop. For this reason precisely, my team and I created Adelie Logistics. It's a QuickBooks app that uses your QuickBooks invoices to determine rental inventory for any given date now or in the future. You can check out our website at https://adelielogistics.com to learn more or find us on QuickBooks Apps. Hope this helps.