there are a couple of things...

if you're trying to shoot a still car at night then set up your tripod and set your shutter speed really slow... like 5-10 seconds if need be.

OR you can turn up your ISO, but that will make your pictures really grainy

OR you can just get new equipment. the key to your situation right now is just a tripod and not a lot of movement. there's no way around it with what you've got.