OS All Cars November 2013 include Vehicle Manager Pro. You need only install template.
Basic of Vehicle Manager Pro Features
Advanced backend and frontend configurations
Customers frontend vehicle management
Rent and Buy Request management
Advanced menu options
Advertisement module positions
In All Joomla templates packages created by OrdaSoft you can find Quickstart Package. Quickstart Package allow you install in few clicks Joomla template, Joomla extensions and Demo data, in final you get full Joomla website. It is very easy.
In the downloaded file, you can find the folder with name "Quick_start_*Tempate Name"
Follow our documentation
It impossible to having these two work together (because OS All Cars November 2013 include Vehicle Manager pro).
If you have other questions, please ask.