Duplo Compatible Car Base 2 x 4

When I printed this nice Jeep https://www.thingiverse.com/thing:1826496
I was missing the base for it.

I designed the base in two version: all printed and version with a 3 mm rod for the axle.
Both work fine, I'm actually surprised how well the all printed version does, wheels spin as crazy.

Updates:
31.7.2017 Added version with bottom connectors. Use wheels from allprinted version.