Measure and mark a straight horizontal line 4 1/2 inches above the door of the camper, using a chalk line. This is the location of the awning rail. Use a carpenter’s level to ensure the line is level.
Mark where the studs are along this line, using a stud finder. Hold the rail against the chalk line. Using predrilled holes in the rail as your guide, mark where to drill pilot holes into the studs. Attach the awning rail on the line you marked, using sheet metal screws long enough to penetrate at least 1 inch into the studs.
Apply a bead of silicone caulking around all edges of the awning rail to seal out water.
Insert each of the black knobs from the assembly kit into the secondary support arm of the awning. Twist the nutserts from the assembly kit onto the threads of the black knobs, but do not tighten them completely. Add a 1/4-inch No. 20 hex lock nut to the bottom ends of the black knobs to keep the knobs from working loose from the awning arms.
Slide the awning case onto the awning rail. Center the case between the black knobs on the secondary support arm.
Insert the flat end of the support arm between the black knobs and the secondary support arm.
Tighten the black knobs to secure the support arms in position.
Measure and mark a spot 5 to 7 feet directly below each of the support arms as they hang perpendicular to the awning rail, using the mounting plates for the support arms as your guide. Drill two 5/32-inch holes for each bracket at the locations you determined. Fasten the mounting plates to the RV with two No. 10-by-1-inch flat-head screws from the assembly kit.
Connect the support arms to the mounting plates by sliding the arms into the plates. With the support arms extended, drill a 3/16-inch hole through the bottom of the main support arm and into the secondary support arm. Slide plastic washers over the ends of a pair of rivets and insert the rivets into the holes. Both rivets and washers are in the assembly kit. Drive the rivets into the holes with a hammer.