I don't know anything about RC (remote controlled) cars.

I'm looking for a RC car with the following capabilities:

Waterproof
Can carry an additional 6-7 pounds
Can control tilt for a camera on the same controller and preferably from the same output on the RC car itself.

Is this possible? If so can you help with any suggestions?

Any ideas would be greatly appreciated!
+ is there a way to synchronize the car control, camera control and tilt control? Thanks.