I find a short section of angle iron (or dexion) makes a reasonably effective wheel chock,, provided the slope isn't very extreme, You can position it as an L, or as an upside down V (I THINK L is more effective, thouigh havn't tested) or nest a V in an L.
In critical applications (as when getting under a jacked up car at worryingly extreme angles) you could put dexion chocks both sides of a wheel and tie or wire them together, though I've never quite felt I needed to.
Bricks can slip, though they usually work well enough. If you give your brick (or bit of 2X4, or steel tube, or just about anything) a wrap of carpet or other strong textile with a "tail" that you roll the wheel onto, that'll stop it slipping. The same trick is used to stop ramps from skooting away from the car as you attempt to drive onto them.
The obvious solution would be a wooden wedge but I've never got around to making some. I THINK I've seen plastic ones in Halfords
I never used the handbrake for parking in the UK, having had it jam on a couple of times. Parking in gear facing a wall did make me rather unpopular when I drove an NHS pool car though.
Thinking about it a bit, I reckon a sandbag would be quite effective as a self-forming wedge with good surface friction, though it would have to be of strong (perhaps synthetic) material..
They stop bullets (which is of course not what you want to do, but still)
Edited by edlithgow on 15/01/2021 at 00:50
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