How do you know you're not going to get scammed??

I'm planning on shipping a car from Seattle to San Diego and while researching shipping options I'm struggling to find one to trust. I find companies that look real and then start researching them and it's a crapshoot on if people had a positive experience. What do you look for when picking a shipper? I really would like one with a lot to deliver to as we won't have an address to set up delivery with.