It is possible to use both themes on one website, but please keep in mind that all of our themes require their own instance of WordPress to run, so essentially you would be looking at an installation such as:
e.g.
yourdomain.com <== Your Vantage installation
yourdomain.com/classifieds <== Your ClassiPress installation
You may also wish to look into a
WordPress multisite setup for the purpose of having one login for your customers to use across both themes.
