Darren, towing is mostly about weight, not just power, the heavier the better. So the vw shuttle will be a better tow vehicle than any other vehicle fitted with the same 148bhp diesel unit.
Diesel is the only realistic option and as big as possible. Ford Galaxy was a good tow vehicle for us, the vw Sharan was better (sadly deceased) I’m sure the extended family of the VW Tiguan would be where I would start my search and I would call in to look at the Ford kuga mentioned.