I never played with the cars in Sims 2 (but now I may have to after writing and posting this LOL), but if we did have them back in the game, it would have to be with a pack similar to FreeTime from Sims 2 (one of my other favorite packs from that series due to the hobbies and hobby enthusiasm). This pack included actions like talking about hobbies, browsing the web for hobby sites, blogging about hobbies, visiting hobby community lots (unlocked with appropriate hobby enthusiasm levels) and being in the Zone when doing hobby related actions (enthusiasm level 10). Being In The Hobby Zone was a major Want for most Sims in Sims 2. It awarded Sims with major Aspiration and Influence Points when achieved, along with a special glow around your Sim when they were In The Zone related to their hobby.
I never played with the Tinkering hobby past studying the Mechanical skill. I remember the pack gave us the ability to buy, repair, and upgrade cars. You could also install alarms on them. You could also drive them to work instead of walking or taking the car pool. I don't remember if you could drive them to community lots. There was also the WooHoo interaction.
I never managed to get my Sims up to a career level where they had the Helicopter as a carpool vehicle due to the fact that I cannot stand the loud sound of the helicopter in the loading video of the Sims 2 UC or the game itself. This has nothing to do with the game. I have mild sensory issues due to my Hydrocephalus and shunt. It would be fun to have it back in the game with a toggle to turn the sound on and off. I don't remember vehicles having a sound toggle in the Options. I will have to look when I load the Sims 2 UC again later today.
As far as clothing options go, there was a Diesel SP in Sims 3 that gave us clothes that went along with having vehicles in the game. I did dress my Sims in some of the outfits so it would be fun to have those back to go with the vehicles.
So in conclusion, a FreeTime hobby EP (from Sims 2), along with Diesel themed clothing (from Sims 3), and a base game update to add carpools to fully flesh out gameplay would be my request for adding vehicles and other related items to the game.
