I think you need to either find a customer and define what you can do for them or define what you can do in total and find a customer. Our biggest business is Arrive and Drive. Yes we build 3-4 new cars every winter and we have 4 rental SM's but the core business is A&D for as many as 20-25 unique customers per year. For us, this is what in generally encompasses:
- Car storage
- Car transport
- Spares storage
- Spares transport
- Fuel and tire management (acquisition, storage and management)
- Pre race alignment by track
- Re-alignments if needed during races
- Full crew duties (including but not limited to things like full damage repair or transmission/clutch/diff replacement, tires, gas, lap times, any driver assistance) during race weekend
- Data and video analysis and coaching
- Off season tech
- Hospitality / driver area for warmth, cool, food
- Post race maintenance service/repair/upgrades or changes
...and it goes on and on
The rentals are largely break even or loss-leaders used as a feeder system into our core competency which is arrive and drive.
If I were you and I think I know what you are looking for, I would do this:
Hook on with a person who needs a crew person at the track, define your role, and charge them a flat fee. Maybe add other customers at that same level of service or expand your service offering for one focused customer.
Or build (or buy) a rental car. Offer 'discount' rental experiences. No guarantee of tire heat-cycles or spares/repair but some simple level of SLA. Make sure you have a signed contract on damage.
Tons of ways to go if you want to talk. Good stuff.