Shaking a load (e.g. boxes, furniture) after tying it to a trailer, to assess if it is sufficiently secured. To pass the Graham Hall Test: when you shake the load, it should also shake the trailer. If not, then you haven't secured your load properly, and you should consider re-tying it.
That Lawnmower definitely passes the Graham Hall Test; When you shake the mower, the trailer shakes too!
Let's do the Graham Hall Test, to make sure my fridge won't fall off.
Let's do the Graham Hall Test, to make sure my fridge won't fall off.
by Darryl Kerrigan February 22, 2023