The simple, effective, and more or less foolproof way to install shock absorber mounts, crossmembers, and other parts that carry suspension loads are "Huck" bolts. They're basically pop rivets on steroids and they clamp pieces together tightly and expand to fill holes completely, preventing any relative motion between parts. They're a lot simpler to install than hot rivets, and they have a 50+ year history of holding big rigs together. Some types of them can be installed without special tools- - - -nothing but an impact wrench is needed.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!