Sure, so one option which was common on the base models in Australia, was a front bench seat on the passenger side instead of the single seat with a centre console. When my fourth child was born, I took the centre console out of my HZJ80 and swapped in the bench seat so I could fit everyone in...
I've also got four kids, and I went with the front bench seat option. Makes the vehicle a six seater, and leaves the back free for gear when camping. Depending on the ages/spacing of your kids, that might be a good way to go.
OK, so I've looked into adding a third row to my HZJ80. Quickly decided against it. It's possible to do, but to get the same result as factory, you'd have to cut holes into the body for the "wells" that hold the bars the seats lock into in the floor. You'd also need to cut those wells out of a...
So this is one that didn't have a third row fitted from factory? Or was it originally built with third row seats, but they've been removed? Huge difference between the two.