We got Peg Perego John Deere Gator XUV, Green https://www.amazon.com/dp/B005WKWLEQ/ref=cm_sw_r_apan_glt_fabc_VH60121GF6QYKKZTN610 and love it. I ended up adding some LEDs under the car, but it has withstood a lot that my kids put it through. It you need extra traction off-road you can take old bike tires and screw those on. This isn't the best for on roads as it puts extra torque on the motors, but you'll be able to drive up a flight of stairs

No matter what you get, make sure it is at least 12 volts, and has two motors