Details on Packard, model 900 and about photographing a car show

The Fun Days in my town are annual festivities in the park close to my place. Highlight of Saturday is always a car show. Equipped with almost every lens I own, I went down that Saturday to get awesome pictures… At first, it was going on well. The old music was playing, probably to get everybody in the mood of forties and fifties. Everybody was far more interested in old and not so old but fancy cars, and not paying any attention to me, snapping photos of just about anything. It was quite hard not to notice them, when I was desperately trying to keep them out of my frames. Not only because I don’t like random people on my pictures. But most of them was not dressed appropriately to match the car from early thirties!
I wanted to use a lot my macro lens for details, but with 80 mm lens I couldn’t get any other picture without walking out of the area! No foot zooming is possible at show like that. So after four or five switches zoom to macro and back, I decided it is not worth it and kept with zoom only. It focuses closely enough for a close up and had wide angle sufficient for a whole-body view. The 18-200 mm lens turned out to be the best choice.
I struggled with two additional inconveniences. Most o the cars were standing there with their hoods open. It was hard for many of them to take a nice, natural side or front view. Also, all those shiny surfaces and owners trying to remove the slightest speck of dust. It was fun, when I anted to picture the reflection of one ar in the other, change the color of the body by using reflection of the net automobile. But it was quite hard to keep me myself out of the frame! And nothing spoils the image of the silver shiny bumper then a blue jacket :(. I could move and change the angle of view. And I did just that, in many situations. But it was not always possible, especially if i was looking for a particular view/reflection. And at first, I actually did not notice that!
Eventually, I came back with few keepers. Learned a bit how to do it better, too.
Anybody out there reading wants to share some of their experience with photographing car shows? What tips do you have? What did you focus on shooting?