I am planning to replace my car with a 2.0-litre or 2.5-litre diesel 4x4 to tow a light boat and I'm unsure what to buy. The village we live in is approached by a steep hill and I also need it to cope with slipways. A car that can select either two or four wheel drive and differential sounds ideal. I will probably have to buy secondhand with a budget of £25,000. Can you please make a couple of suggestions?