QB Issue Resolution:

As intuit says you would need to use non inventory type items, the problem is that they do not stock qty on hand

even if you use inventory items, in a way differently than it is designed to be used, QB does not do serial numbers/lot numbers, etc so the SKU code that intuit says you can use, can NOT be used for that.

Truthfully QB is unsuited for rentals, I use regit Express (used to be called regit pos)  for rental and just post a daily summary of financials in QB
http://www.free-pos-software.com/

Resolution for Issue 'Hi there! Is it possible to integrate QuickBooks into a tool/equipment rental business? Is there a function that allows you to charge for days out; booking back; etc?' available: Yes (Solved).
Source: Intuit Community forum.

Hi there! Is it possible to integrate QuickBooks into a tool/equipment rental business? Is there a function that allows you to charge for days out; booking back; etc?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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