I can't think of any way to improve this vehicle. Even after almost 19 years it still runs like a champ. Add gas and change the oil and it will never let you down. Even with 121k miles it can keep pace with interstate traffic and off-road like it was new. The designer thought of everything. They don't make them like this anymore. I'll only drive a Montero after owning this one.
Full size spare mounted on swing-gate rear hatch. Spacious engine compartment allows for easy maintenance and inspections. Huge back seat that an adult can sleep on during long drives. Tall with lots of head room. 17-22 MPG, as much as a new SUV gets. This one was WAY ahead of its time.
I can't think of anything that the designer didn't already put in here. Even the turning radius is great.