I can't see why you'd need the "impact" and torque of an impact driver for this. I see many using just a standard rechargeable drill. It's really hard to control an impact driver compared to a drill. You could easily over-tighten the jack when winding it back up and damage something. I've used an impact driver a lot and would never use one on an RV for anything. A variable speed drill (with sufficient power) would be nice for this.
Impact drivers are also noisy. I'd be ticked at someone next to me winding their jacks up or down with all that noise. Grrr.... Elec. stab. jacks and tongue jacks are noisy enough as it is.
