Have you thought about a 'stripped' texture mod?
Instead of nice comfy carpets just bare metal. For added comfort riffled metal under the driver's feet, and otherwise only what's necessary (i.e. the frame of the vehicle, and one leather belt to close the driver's door).
I don't know how well this will work with LFS because the models weren't made for this, but you might want to take a look into it...
Vain