We've had a 1995 Daihatsu 4-Trak diesel for a good 10 years now, it just keeps on going. It had a front-end crash a couple of years ago, but was so economical to repair that the insurer didn't write it off, despite it's age. It needs a bit of welding now and then to get through the MOT, but nothing major. It had to have a new bellhousing not long ago, but I picked one up cheap from an excellent 4-Trak breaker in Herefordshire (pm me if you need his number). The 4WD Low traction is excellent - I've even used it to pull a 2WD tractor out of deep mud ! The 4WD High traction is a life-saver on icy roads in the winter, it can be used at up to 40 MPH. It carries a fair size load internally, and the roof-rack (if you can get one, they're like hen's teeth) gives useful additional capacity. It tows up to 3 tons gross, and my wife regularly uses it to climb the steepest of welsh hills with a horsebox with horse on the back. The only downside is that it's only available as a 2-door model, so if you've got ancient aunts to fit in the back it might not be suitable.
Do be careful to have it properly examined before buying though, as there are quite a few around which are 2 different half-vehicles welded together...