means no force on them from above or below, as if they were already off the truck, the arch will be exerting some pressure on the mounting ends, you don't want to add to that

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics