This is a good idea!
Details such as car type, colour, engine type, and wheel size would be invaluable in answering queries.
As an example - a simple question about tyre pressures can descend into chaos as various people quote their car's pressures without anyone knowing what car/wheel setup each person has.
A simple detail panel with in my case:-
MGF mk2 Freestyle
Anthracite
1.8i MPi
16" wheels
would be enlightening!
edit - this info could go under car name in the initial garage window. BUT, not everyone has a garage!
David