Some people (like me) went with a Milwaukee 28V battery-powered right angle drill. You can get them online (in the US) in the low $300s and then you need the bit to fit the winches. People who use them love them. They are not really water-resistant so there is that. You can get extra batteries - not cheap
though - but you can replace them easy unlike the Winchrite (unless they have changed them). A bit heavier and more awkward. Tremendous torque/power. You have to watch or you can over-winch and break stuff. You can vary the speed by trigger pull. Bullet-proof trades tool from a very good manufacturer.