This turned out to be an interesting thread. Thanks to all the contributed. I am glad I was not alone.

Since I originally posted, I certainly have curtailed my overpacking on airline trips. Unfortunately, I just went on an 8 night vacation road trip, and I again packed like I was going on a world tour for three months. I think that the "car and car trunk" gave me a false sense of space to pack. And pack like a hoarder I did. I packed four very large bags and a medium duffel bag. I also threw in an electronics bag, and an electronic duffel bag cooler that can plug into your cigarette lighter socket or (with an adapter) can be used in a hotel room with 110 AC as a small fridge for rooms that have no fridge.

And it was horrible. Again, I found myself looking through bags trying to find things. It took hours to pack and unpack. This was a problem with changing hotels/resorts four times. Half way through the trip, I spent an afternoon taking about 15 percent of my packed items out of various large bags and consolodating them into two small bags for the remainder of the vacation. NEVER AGAIN will I overpack for a road trip. I am applying the same principles of airline travel to road travel. With the exception of carrying the small duffel bag electronic cooler - just in case the hotel has no fridge. My benchmark for any trip from now on is as follows;

If I need a hotel cart or a Bellman with a luggage cart to carry my bags to the room, then I have overpacked.