Isuzu Elf from 6 to 4 tires

[vinj]

I see some trucks do that. Wouldnt it make it more unstable and prone to tip-over since the design was for 6-wheels?

[v22]

It does if you mount the rear wheel like you would the ineer wheel.. if you mount it the way the outer wheel is mounted it becomes almost as stable as a 6w provided it is not loaded to its maximum payload capacity. 4W and 6W trucks vary only a few inches in dimensions and commonly with the same engine. Payload capacity is the main advantage of a 6W truck.