Austin 7 in books.

[Tony Griffiths]

I had a trailer like that once; a friend loaded it with a half-ton of gravel from a quarry that must have contained a good deal of lead (the quarry cut into old 'lead rake' workings). He almost lost control of it going down a short but steep hill - the resulting tyre marks looking precisely like those on a skid sign, but four times as long.