I have this same question. The general consensus is that the Prodigy is the best on the market. There are, however, some hydraulic control units that it was potentially not compatible with when it first came on the market. One of these was the Carlisle HydraStar that is used on the Kimberley. I'm still looking into this as everything I've read about the Tekonsha Prodigy is very good including the Off-Road aspect. The Redarc, seems to be a good solid basic unit but is in a different league to the Prodigy.
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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