Adam. I Won't be going this time, but I have been a couple of times to watch the truck racing at Brands. Early 1990 if I remember. It was when the drummer from ABBA (Slim Borgudd) and Steve Parrish were racing them. Had a great time, and I'm sure you and your family will too.
The power of those trucks is just amazing, and sitting at paddock bend you could see them come out of the last corner and power slide all the way to the finish line. Have a great time, and hope the weather is good.
Ooh, and don't forget we want to see some pics.