Correct. If they come off on course you will lose the scale points, make sure they are securely fastened.
Curious ..... so if anything you get scale points for falls out then you lose the points? Like say a cooler in the back comes unglued or strap breaks and the cooler falls on course. (just an example)
If you pick it up and put it back on the vehicle does that get you a touch penalty and re position?