SuspensionArms with Stub Axles for BlackCrows "Rock Hopper" Camper

Modification of original model from BlackCrow: 
https://www.printables.com/de/model/278505-rock-hopper-off-road-camper-18-scale-rc-model-by-b

This remix moves the bearings of the wheels from the rim into the hub, which then accepts a little stub axle with 12mm hex, so any  wheel with 12mm hex can be mounted on the camper (like some shiny aluminum CNC rims).
Bearing seats are drawn 10.1mm, might need a  little bit of sanding to fit the bearings depending on your printer.

Parts needed:

• 10x5x4mm ballbearing (two for each side => four total)
• 12mm hex wheel adapters
• stub axles (make yourself)

This mod requires some additional metalwork for the stub axle!
As those are fairly simple, and should be easy to replicate just by picture, i couldn't be bothered to create a drawing. Distance between the outer ends of both bearings is 23mm. 
I secured the backside with a M3 screw and washer, but one could of course also directly turn a small shoulder, or make it a litte longer and use a nut.

Access to a lathe to make these of course being ideal. But I think it should also be possible just with a benchvise and some basic tools, using M4 threaded rod and 5x0.5mm precision tubing, just passing the rod completly through and putting a nut in the back).
(trickiest part being the small hole for the hex adapter pin, this could take some tries to get right)