SMITH, Judge.
Appellants have not produced any agreement or shown any relationship between Mid-Florida and appellee Sawyer suggesting Mid-Florida would indemnify Sawyer for damages resulting from his negligent acts. Nor have appellants properly invoked the dangerous instrumentality doctrine. A trailer is not a dangerous instrumentality, and appellants have not shown Mid-Florida exercised ownership or dominion over the tractor.
AFFIRMED.
MILLS, Acting C.J., and ERVIN, J., concur.