We had a nine-day full-size rental earlier this month. I really, really wanted to get an Impala because of it's large trunk. The Impala is National's "poster car" for the full-size category ("Impala or similar car"). When we went to the full-size aisle to pick out a car, I was disappointed to find nothing but Lacrosses and Grand Prix's (and maybe a Malibu or two). I had a Lacrosse earlier this year and wanted to avoid that, so I settled for a Grand Prix. After we put our luggage in the trunk (all that would fit anyway), I noticed an Impala next door on the Emerald (intermediate) Aisle! Looking further, there were several Impalas on that aisle, but none on the full-size aisle, where they are supposed to be the standard! And Impalas have larger trunks than either the Lacrosse or the Grand Prix! I was tempted to take one of the Impalas from the Emerald Aisle, but didn't want to cause a problem at the booth, and also really didn't want to take all our luggage out and repack it. So we put one suitcase in the back between our two boys. Next time I'll just reserve an intermediate, and save $40 while getting a full-size. Note: This was the only problem is an otherwise pleasant car rental experience.