I did another video, this one shows how I load my camper.
The ground leading to my shop is sloped sideways some about 20 feet away from the shop door, so I don't have a great distance of level ground to back up and get the truck line up straight to get under the truck. I park the camper to the far side of the shop, which also makes it hard to get lined up because I have to watch my dually fender and truck mirror to keep from hitting the door opening on the shop. As a result, it takes multiple attempts to get straight under the camper.
The green carpeted spacer is used to keep the camper spaced back away from the front of the truck bed. Without that spacer, the rubber bumpers on the front of the camper will contact the sheet metal on the truck bed where the metal has an angle bend in it. If the bumpers were lower or higher, they would contact the front bed wall where the sheet metal is complete vertical.
Regardless of where the bumpers are attached, I still like the spacer idea because if the camper were to move with no spacer, the bumpers would put a lot of pressure at two points on the bed and could bend the sheet metal on the truck bed. The spacer distributes the pressure across the entire width of the truck bed.
With that said, my camper has never moved in the 8+ years I've traveled with it.
There's also a white stripe I painted down the center of the bed mat and a black piece of tape on the front of the camper marking the center to help get centered.
Loading my AF 811