My two cents...the application should be able to do the following.
list all dealers in the world, their phone numbers, email, address and maps to the location....ideally dial when selected, ideally map based on my gps location at the time I do the look up
allow me to keep maintenance records in a central location including what was done, cost and technician and service department info such as name and address ..if it could tie it to CARFAX or similar service that would be good. Thinking ahead when or if I sell to provide records to new owner
Offer road conditions and construction (warnings) information so I can plan accordingly
Offer weather conditions and forecast based on location and have a mechanism to look at way points when selected
provide historical information on all model years, engine sizes and details for common used components like tire size, belt size, oil and fluid types part numbers from Victory
have a mechanism to renew my VRA membership log my details and provide me numbers for road side assistance
that was a quick list...give me time to really think it through though