Good Lord, greydigger,
Where did you want to drive him to

?
We had a neighbor who could not make it to his mother when she died (he is disabled), and I was able to arrange for the funeral home to load it in the hearse and bring it to his house. He spent a couple of hours with his dead mother, and then they loaded her back up and took her back to the funeral home.
Do you really want to know what happens to your body when you leave it to science? It is different than leaving it for "parts". I mean, I'm glad, I guess that people do, because, when I was in nursing school, we had use of more than one cadaver.
Any number of things can happen.
First - have you designated a certain facility? Because, that can make a difference. If it goes to specific universities or medical schools, they may actually charge your heirs. (depends on how the facility is funded).
Second - It can be used to practice surgery, of all kinds - removal and reattaching of limbs and other things, it can be used to grow skin grafts (parts), it can be used to train autopsy students, your head can be used to practice facelifts, and many other types of facial surgery - from burns to wounds to cleft pallets.
It can teach students how to implant teeth. It can be used to teach students what happens as the body decays. (that also teaches investigators of crime, to help them learn how to identify times of death). It can be put in a grave, or a trash bag, the trunk of a car or a freezer - all to learn how victims cases can be solved by forensics.
Our cadavers had lots and lots of stitching and injections (can't kill a cadaver with an air bubble).
You can be used to test safety equipment - a human crash dummy - it can be used to see exactly what happens when a body is thrown over a cliff post-mordem, rather than while still alive.
Know enough, yet? Sounds grisly, I know, but, honestly - cadavers have saved thousands and thousands of lives. Know exactly what you want to do, because you influence AFTER, is very slight. Certain institutions, if you set it up with them in advance, will make minimal "exceptions", if you ask.
Sometimes - you do end up all over the place. If an institute needs heads, and one needs arms and one needs feet - (and they do test prosthetic devices on cadavers, sometimes, along with learning better techniques to put our soldiers back together better) - you are going to travel - and maybe more than once.
There is one institute, I think its called ScienceCare (but not positive), who will take care of your final expenses and bear all the costs of transportation, etc.
Personally, if I left my body to science, I would donate it to a certain institution of my choosing. Then your family just has to call them, and they will do the rest. And most funeral homes know how to hold a body for scientific research (its a little different), especially if you are planning on a funeral.
Aren't you sorry you asked?
Beth