A friend asked me if I could make some tire thumpers for a local school bus company. I never heard of such things!
Evidently they are used by bus and truck drivers to check for low tire pressure, especially on the inside tires of dualies - thump the tire and listen to the sound. The guy said some people kick the tires but others have problems with this, especially smaller women bus drivers.
I looked these up online and from the comments discovered many people who buy them from Amazon get them for a personal protection device to keep in their house or car.
I made a couple of quick prototype shapes, hickory and walnut with no particular attention to detail or finish. These are about 20" long made from 2x2 stock.
These might be an opportunity for someone to make some money turning some simple things. I don't know the extent of the "tire thumper" market, but this one bus company wants about 30. They are evidently available in truck stops but pricey.
JKJ