Prepping a car for shipment is not complicated, but there are a few things to get right. Here is the list.
Remove everything from inside the car
Carriers are not licensed to transport personal items, and that includes tools, gas cans, weapons, and anything else you might leave in the trunk. The carrier expects your car to weigh a certain amount. If the truck weighs in heavy, they can search the vehicle and remove what should not be there, and they are not responsible for replacing it.
Wash it
The driver inspects the car before loading. A dirty car hides dings and can make grime look like damage. If a scuff gets noted on the pickup bill of lading that was really just dirt, you have lost the ability to claim it later. The cleaner the car, the cleaner the inspection.
Check the tires
Enough tread, no bulges, no leaks, proper pressure. You do not want a tire problem during loading or unloading.
Note the mileage
It is rare, but you want to know if the car was driven while out of your hands. Write the odometer reading down.
Check for damage
Walk the exterior and note every dent, scratch, and chip. The driver will do the same and mark it on the bill of lading. If they mark something you do not see, ask them to point it out before you sign.
Prepare a key
The driver takes a key with the car. Give them a spare if you have one. If it is on your key ring, take it off ahead of time.
Leave the tank about a quarter full
Enough to load and unload along the route, not so much that it adds weight.
Conclusion
A little preparation makes the whole transport go smoothly. Next: what to expect at pickup.