Sorry for your loss!
First thing I'd do is make sure you can document the trip. Decent cameras with enough cards, batteries, etc to take tons of pics.
Next, the in car stuff. Tools, a jug of coolant, oil, brake fluid. Wire, duct tape. A couple of old plug wires (they have tons of uses, ask me how I know). A decent jack, not a bumper jack, and a spare that's good.. make sure it's good by putting it on and running around for a bit.. sucks to put a 20 yr. old spare on and have it go flat a mile down the road.
If you can have a 'chase car' (or a truck or van) with all this stuff in it follow you (with a tow strap) might not be a bad idea... and they can get pics of the car on the road :)
Good luck to you!
