In rec.autos.tech, on Fri, 23 Jun 2017 13:00:03 -0400, micky
> wrote:

>
>Or go to a scrap yard with a scale for weighing the pickup trucks and
>tip the guy a couple bucks to tell you when your front wheels are 3 feet
>onto the scale and after you drive forward, when your rear wheels are 3
>feet from being off the scale.

Or better yet, half the distance from the front to the back wheels.