I think the solution you provided is probally the best. I had noticed too that some pages becomes really big and take a long time to load, but what about the 'soon to be added' series Knight Rider, it probally will have a lot of cars too, so it might be a good idea to list it a episode at a time.

How ever the Pontiac Firebird (Kitt) will be listed over and over again in each episode, what is the use of that??

Can't we just list all vehicles for 1 series under 1 name, but set a max of images for a page, so you have to go through to page 2? That way, you will keep 1 main entry for the series and can maintain the alphabetic listing of vehicles (so vehicles won't be added multiple times)