Rose,
If your machine has a cover and a handle might I suggest putting the machine on the seat of your car and then seat belt it in.
My sewing machine guy told me that and believe me it does work.
I took my Viking Designer Diamond to be cleaned and normally world put it in the back of my Suburban.
Well, when he took it out to the care he said my dorm of transport was all wrong and suggested the seat belt.
It sure saved my as I had to stop quickly and the machine stayed nice and snug in the seat.
It surely would have ended up damaged if I had transported it home my way