Isn't this already done by (for example) U-Haul? They would quickly go out of business if you couldn't rent a truck one-way, or if they couldn't manage their in

Isn't this already done by (for example) U-Haul? They would quickly go out of business if you couldn't rent a truck one-way, or if they couldn't manage their inventory. U-Haul's business model is not precisely the same as Zipcar's, but it's pretty close.