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I've heard of people using a Hurst Roll Controll as an e-brake. I know it's not the intended purpose but it sounds like it worked for them.
The Roll Control works fine, however in many states a "mechanical" E-brake is required (for the reason Vile mentioned likely). Also I believe it will drain the battery while sitting (12v power used to hold the solenoid on). This could lead to other things...dead battery or worse dead battery, solenoid releases, truck rolls away. Lorne