I've bought and sold several vehicles that required shipping. Most were sold without an in-person inspection. I could really write a book on this sort of thing, but Ill try to keep it short. Any questions, feel free to PM me.
Usually in a situation like this you end up talking to the person over the phone or email multiple times before the exchange of funds. Through these conversations you should be able to get a feel for the transaction. If it doesn't feel right, walk away or require cash in person.
If it feels like a good deal with a decent person, you need to get as much contact info for the person as possible and try to verify it. Get a phone number and talk to them on it. Get an email and email them through it. Try to get a work email or other verifiable address. Anyone can register an email at yahoo or gmail, but not too many people have access to an @initech.com email. If you get a company email, google search the company, see if their name on the company roster matches up. Google their email address(es) and see what comes up. Reverse lookup their phone number. It sounds like a lot of work, but it really only takes a few minutes. You want to make sure you are dealing with a normal, real, person that has something to lose by scamming. If you find out that the phone number is a TracFone and the emails are throwaways, then you have a right to be nervous.
If I am the seller I try to get as much of the money up front as possible. I will settle for 50% up front at the end of the day. Remember, the buyer wants to protect himself as well. That first payment will be a leap of faith. Write up a bill of sale and make a note that $xx.xx of $xx.xx has been received. You want to document everything as much as possible. Anything related to the deal, do in email so you have a record of it. If he calls you to tell you that the money has been sent, just politely ask for him to copy that information to you in an email. It is a lot easier to search emails for dates and amounts than it is to recall phone conversations. It is also a lot easier for police to believe if you have it all in writing.
Try to get a bank check drawn on a bank that is common to both of you. Cash the check at your local branch. If necessary, call the bank that it is drawn on and try to verify it's legitimacy. Due to privacy concerns, they may not tell you much, but with some thinking, you can figure out a way to verify

. After the money has arrived and cleared, they are free to arrange shipping. Usually I will tell the buyer to start arranging shipping as soon as I receive the money since it takes some time to find an available driver for the route (it all goes through brokers). Be sure to make it clear to the buyer that although they can arrange shipping, make sure the driver doesn't show up until you have the funds cleared. The shipping company will meet you at your location (usually 2 days before or after they say they will be there) and load up the vehicle. They go around the car and scribble all over the paperwork noting existing damages.
I will continue to hold the title to the vehicle at this point.
Usually I get a photo of the vehicle loaded up on the trailer and email it to the buyer. Some time later, the vehicle will arrive at the buyer's residence. After his inspection, he will send the remainder of the money. I will mail the title and final bill of sale after that money has cleared.
If the first money doesn't clear, don't ship the vehicle. If the second money fails to clear and you can't resolve with the buyer, report the car stolen and inform the authorities of the situation. This is where your diligence on keeping accurate records comes in. The more you have proving your story, the better off you are. Keep insurance on the car until the final money has cleared and the deal has been complete for a couple of weeks.