(AOL Autos)  -- Have you ever wondered what your neighbors are carrying around in their car's trunk or SUV's cargo hold? I decided to find out -- by asking 100 strangers in a department store parking lot.



Strollers, playpens, toys and diapers take up a lot of space, but a lot of parents still had organized trunks.



The mission



To uncover the secret contents of the average American trunk and cargo hold.



The stakeout



I spent two weekend afternoons at the Empire Center in Burbank, California, with my camera and notebook, approaching shoppers as they arrived or departed. I identified myself as a reporter for AOL Autos, and asked if I could see what they had in their trunk, and maybe take a picture. I hoped that I'd be able to see a trend in trunks. AOL Autos: Small cars with room in the trunk



The raw data  My decidedly unscientific study yielded some interesting results. First of all, I discovered that even in a big city (Burbank is a suburb of Los Angeles), people are exceedingly nice if you are respectful and forthright.



About 80% of the people I approached were kind, open and helpful, and gladly opened their trunks for a glance. The 20% who refused were either in a rush, guarded or shy -- but they were still remarkably polite.



The second surprising thing was that the vast majority of trunks and cargo holds were clean and uncluttered. I really expected to discover overstuffed trunks, full of cast-off items and flea market finds. But even the most fully-used storage areas were tidy and organized. AOL Autos: Used fuel-efficient crossovers



Not surprisingly, people with small children tended to have the most crowded trunks and cargo holds. Strollers, playpens, toys and diapers take up a lot of space, but most families have discovered that clean, organized trunks make getting to your kids' supplies much easier and more efficient. AOL Autos: Best new cars for 2009



Another trend I noticed was that athletic folks tend to use their car's trunk as a portable gym locker. I saw a lot of gym bags, sports equipment and sneakers. On a hot day, this was a bit of a mixed blessing; baked sneakers have a decidedly pungent odor. No one seemed to have a good solution to this problem. I would put a cabin air freshener, like the Little Tree, in my trunk if I regularly carried my tennis shoes. AOL Autos: Celebrity cars you can afford



For the non-athletic, the most common item I saw was the collapsible chair. One family had an entire beach setup in their trunk: four collapsible chairs, a beach blanket, a sun umbrella and an empty cooler, all neatly tucked against the back wall. They said that they always wanted to be ready for a beach day, should the opportunity arise.



Some people were extremely proud of their trunks. One woman bragged that her brother taught her how to organize her tools, and that she had taken the organization to the next level. She had multiple storage boxes in her neat, clean trunk, each with a different set of useful items. AOL Autos: Most fun cars for under $20,000



A few families were downright sheepish about the state of their cargo holds. They apologized in advance before opening the trunk, and said that they were in the middle of a project that had foiled their attempts at organization and cleanliness. I have to take them at their word; I'm not making a return trip to that hot parking lot to follow up.



The conclusion



After two days pounding the asphalt, I'm pleased to report that I actually uncovered some useful information and some fun trivia.



There are good reasons for keeping your trunk as empty as possible:



1. Less junk in the trunk equals less weight, and less weight can mean greater fuel efficiency.   2. Under certain circumstances, shifting content in your trunk can adversely affect handling.   3. An empty trunk provides space for that roadside find or warehouse store bargain. How else
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