different between axletree vs wheelbase

English

From Middle English axiltre; equivalent to axle +? tree.

axletree (plural axletrees)

A bar or beam of wood or iron, connecting the opposite wheels of a carriage, on the ends of which the wheels revolve.
A spindle or axle of a wheel.

wheel +? base

wheelbase (plural wheelbases)

The horizontal distance between the front and rear axles of a road or rail vehicle.
- 1937, Robert Byron, The Road to Oxiana, “Kala Nao,”^[1]
  Beneath the snow, and after we had left it behind, the road was as greasy as vaseline, as steep as a scenic railway, and often not a yard wider than the lorry’s wheelbase.

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