Had the same problem on our 2012 3402RL. After searching other sites, including other brands, ended up getting some 2" X 1/8" thick aluminum from Lowes, #10 X 1/4" RH machine screws (to screw into threaded holes I tapped into the aluminum to attach the strut brackets to the aluminum), and some #10 X 1/2" Stainless RH sheet metal screws to attach the assemblies to the doors. I cut the aluminum into 8" pieces, mounted the brackets centered on the pieces (had to radius the top edge to fit the curve of the door trim), and attached the plates to the door with 8 of the stainless 1/2" screws, 4 at either end. These haven't loosened since doing this fix, and it's been at least 6 months, and we are full timers. I think why this works is I've spread the torque on the brackets, twisting up and down when opening and closing the doors, over a much larger area. Also the screws I used are 100% better than the flimsy little screws they had the brackets attached to the door with.
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