After you drill into your camper to install the Swagman Roamer LT Roof Rack for Pop-Up Campers and Camper Shells # S80510, there are three things that will go underneath (on the inside) of the camper: the metal plate, a washer, and a nut.
As far as the distance for the feet from the end of the camper, the instruction manual recommends to get as close to the edges of the top as possible. I went ahead and attached a picture from the instruction manual that shows this. It is step #4.
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