This is an interesting topic for new feature for Tryton. It remind me this New invoicing method when selling both goods and services - #3 by ced.
So I think there is a generic feature that could land in the standard Tryton which is the ability to create work order when a sale order is confirmed.
This work order could be linked to an external asset like a vehicle.
There is no bounty system in place on tryton.org but you can hire one of the Tryton - Service Providers.