Just a suggestion Dave ... Use the three wooden axles as in your photos, but slightly elongate the round chassis holes vertically. This will allow the wheels to adopt different levels on uneven terrain. They will of course then adopt off vertical stances, unlike the real vehicle, but I could live with that. On level ground the axles will all rest at the top of the slot, so it's best to set that at a static 'norm'.
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Keep on snippin' ... Johnny
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