The tanks that I have seen cars fluids getting drained into look like a beer keg on four wheels.
Theres a vertical tube in the centre, thats extendable & its got a wide funnel on the top of the tube.
The guy wheels the unit under the car, unlocks the vertical tube & extends it upwards, locks it & undoes the plug holding the engine oil etc in & removes it.
The fluid drains out into the funnel, down the vertical tube, into the beer keg unit.
this pic took ages to arrive>
This pics a good one & another, probably more simple idea >
(the swing arm ideas a good one)
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