Pay close attention to the placement of the ball studs on the swing arms in Pic 18.3 to get the cam locking action. Place the ball studs closer to the trailing edge of the arm, not in the middle.
Tire carriers, can carriers, cooler racks and ladders will all use a 15” gas spring. We used to have one 12" and one 15" spring but now we use the same length for both arms. See pic below.
AGAIN- We now use the longer 15" shock for both swing arms.
Drill and tap the holes for the ball studs using a 5/16-18 tap. You can weld the ball studs in but it may cause problems later if you have to replace them.
View attachment 126606
FYI these holes are now 8mm not 5/16-18!