The answer depends on the volume of the individual suitcases. Also, because they are rigid, it also depends on the dimensions of the suitcases.
The Ford Fusion has 2 axles.
The 2009 Ford Fusion has 16 valves.
The 2008 Ford Fusion has 16 valves.
The 2011 Ford Fusion has 16 valves.
The 2010 Ford Fusion has 16 valves.
The 2012 Ford Fusion has 16 valves.
The 2013 Ford Fusion has 16 valves.
The 2007 Ford Fusion has 16 valves.
The 2006 Ford Fusion has 16 valves.
The 2014 Ford Fusion has 16 valves.
The trunk of a VW Golf typically has a capacity of around 380 liters. This can usually accommodate two to three medium-sized suitcases, depending on their dimensions. If you opt for smaller carry-on bags, you might fit more, but the exact number can vary based on the specific model and configuration of the trunk.