I just did a 2,000 mile roadtrip to Germany last month.
See a short video of it here: https://m.youtube.com/watch?v=y0ymv8jOC0Y&feature=youtu.be
The things I did before my trip included (btw you don’t have to do all of these but I did because I was going to the Nurburgring):
Suggested:
Engine oil + filter
Diff oil change
Gearbox oil change
Coolant flush
Highly recommended:
Check the health of the battery
Check the health of the bushings
Check the condition of the tyres
Check the condition of the brakes
Change the brake fluid (if you are considering lots of spirited driving or some track driving)
Give the car a full clean as you will be in it for a long time
Install a GROM (this enables you to charge your phone and play music at the same time whilst keeping the stock radio, it also enables you to connect your phone to unit via Bluetooth so that you can answer calls handsfree)
Get a sat Nav with Europe maps (although you can rely upon Google Maps, the latter will use data on your phone. Plus having the option of both is handy when one decides to pack up)
Mandatory:
Get Eurolites
Get a healthy and safety jacket
Get a warning triangle
Get 2 breathlisers
Inform your insurance and arrange breakdown cover
Insure your passenger (2,000 miles is a lot of driving!)
That’s my tuppence worth, enjoy your trip!