Asset Rental or tracking plugin?

Hello all, I’m building a site that the person wants to be able to track assets with to a minor extent.

The functionality of the site will go something like:

There is a product, the customer will have 4 of these products assigned to them each will have a unique serial #. At any time the customer can ship one or more of the product back to the company for maintenance.

There will also be training video’s, advice areas and posible a forum. All of that I can take care of with one of the membership or subscription plug ins.

What I’m really looking for is the asset plugin or a subscritpion / membership plugin that has asset tracking.

Any ideas?