Defender as a long-distance vehicle – which model (short version) is recommended?

Hi, in view of the increasingly unreliable weather in Germany, I have the idea of selling my motorcycle (either I don’t have time to drive or the weather is too bad) and to get a Defender (short version) with fabric cover, which can be moved completely open or closed depending on the weather situation. However, given the excessive costs of individual traffic, I think it is nonsense to consider three cars in the family, the Defender should simultaneously serve as a replacement for my Opel Omega 2.5 DTI, which I travel as a long-distance commuter every day on 150 km of work. In addition, it would serve as a towing vehicle for my caravan (ZGG 1600 kg). Which model (diesel) would you think would be most suitable for this purpose?