Having a ladder come adrift from a vehicle has always been a pet fear of mine.
A former workmate of mine when I was an EC, had the step-ladder fly off of the top of his van one day and it flew through the windscreen of a car that was following behind him.
Luckily no-one was seriously injured.
When I first got the faults truck that I now drive at work it had some old leather belts to hold the ladders into the gantry, I checked these one day and two out of the 4 belts were about ready to break.
I removed them and replaced them with sets of Nylon Tie-downs:
Similar to this arrangement, but I have the tie up the other way and the "buckle" part of the tie-down is held to the gantry frames with 3 heavy nylon cable ties.
It makes for a rather solid fastening for the ladders.
I changed it originally because the ladders used to rattle in the gantry.
Things that rattle really annoy me.
[This message has been edited by Trumpy (edited 12-10-2005).]