Boat controller in a truck?

[MetalMan]

If you use an appropriately sized Hydra ESC heat shouldn't be an issue. And I would say no to water cooling as it's just one more thing to go wrong.

With the boat ESCs they typically don't have the same braking characteristics as true car ESCs. This almost makes mechanical brakes a necessity, unless the Hydra's brakes are unlike those of a typical boat ESC.