I only drive and keep insured the 4Runner, GTI, and both motorcycles. 4Runner actually helps, I think it costs around $47/month to keep it insured liability only, then listed as my primary vehicle, I do drive it most of the time. When I have the GTI as a secondary vehicle, even with full boat coverage, the rate is much lower (save more) than the $47/month premium I pay to insure the 4Runner.
It's complicated, given my line of work, I'm in real estate. Own the 4Runner and the motorcycles, lease the GTI. Cars through Progressive, and bikes through Dairyland (Sentry).
You should work with your agent to see how they can fit a plan best for you, often what I've found is the greatest cost is actually maintaining two cars at once.
Hope the mess helps at all.
*The car I forgot was a 2003 Jaguar X-Type 3.0. Sluggish dog which also makes me appreciate DSG. Also a lease.