Where the figures come from. The maker's own announcements and the trade press around the show, each with a link. A figure that only secondary coverage carries says so in its hint and has no link. Rows nobody has published are left empty rather than guessed — and a show is exactly when they get filled: if you stood at the truck and know better, put it on the sheet. The same sheets are on etrucksandchargers.com, built from the same files; a change confirmed on one site shows on both.
How the sheets work. Open a truck, type into any field, press Save and confirm the link that lands in your mailbox: the value is then on the page for everyone, and every sheet lists its history of confirmed changes. Your name and remarks go in that history; your e-mail address never does. Sources disagree on many of these trucks, so if you know better, say so in the sheet.