If we got one of the big transporter efforts to go down with say 10-15 cars how much would it cost each?
The main problem with transporting a large number of vehicles at once is
coordination - you would need to get all the cars in the same place at the same time to get them picked up. Also when we've asked around before, it's turned out to be very expensive anyway (like 1,000s).
Shipping one or two cars at once is probably the optimum number, especially if you take one and pick up another in the same trip.
What insurance issues are there?
I asked a ferry company once what liability they had for my car and it was very limited - I don't know how different that would be for road haulage, but my guess is that the haulage company typically offers only minimal insurance against damage and it's up to the individual to insure the cargo beyond that. However, in the rather special case of transporting cars, I've had a poke about on 'tinternet and at least some are offering 100K cover per vehicle.
Lawrence, are you thinking gentlemen's agreement or were you thinking of establishing a limited company to take the proceeds, own the vehicle, etc.?
The gentlemen's agreement has most scope for being efficient and yet profitable, but involves an element of trust (and risk - the rare case of a vehicle being damaged in such a way that it couldn't be covered by the owner's car insurance policy).
The limited company approach brings in full bureaucracy (tax, insurance, health and safety, accountancy, etc., etc.) and with it the full costs.
Cheers,
Robin