yes, it's factory, at least in the TF years - the rubber vents are to let the air out in a controlled way to cushion yer fat butt when the truck bounces over the potholes grin

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