My hobby is R/C sailing. My previous transporter was a chevy HHR Everything fits like the proverbial glove... 4 sailboats and associated gear...
The case in the front seat is spare radios, tools, ect I could probably pare it down enough to get a passenger.... in my HHR it was not uncommon to drive 12-14 hours to a weekend event. it will be interesting to see how the prius does on a long trip