2 1:64 Diecast 1959 Cadillac Coupe de Villes and one CASE IH 225 Tractor for the wheels.
Had to check some tractor stat sites for getting a tractor with the right size tyres. According to the mad max wiki those at the back where about 70 " so that helped a lot.
It now measures 6.2 cm in height, which would translate to 396.8 cm, which I'm very happy with since again according to the mad max wiki it's supposed to be approx 4 meters.
The front tyres though seems to be a little big and the two cadillacs are a bit messed up because I'm using some regular super glue and, well, that's just a mess.
Now for the double V8!
Thanks for looking!