I have a 1987 Nissan UD, with an 18' box and the larger, naturally aspirated six cylinder. Body rot was my biggest problem, although the newer ones are supposed to have that problem solved ( I live near salt water). It's easy to drive, and the ride is better than similar size domestic trucks. I got about
13 mpg initially, probably 11 now. 17,600 GVW, brakes are great, even fully loaded. Acceleration is OK, but top speed is about 64 mph. I would seriously consider a four cylinder shorter bed version if I was in the market for a truck.