Quote: So...the general consensus is the Mopar Box is too flimsy a deal?
The boxes are only 1/8" material but so is the frame rail. Besides, the holes are close to the rails and crossmembers so there should be plenty of strength there. If the spring eyes were out towards the end of the boxes it would be a whole different story. The boxes are 3-1/4" inside.
Don't cut out both sides of the framerail, notch the rail so one side of the box fits against the inside of the rail which will double the thickness of one side of the box. drill a series of holes in the framerail so you can plug-weld to the box. For an added measure, cut a patch out of the floor so you can weld the box in inside the frame rail. Weld the patch back in when you're done.
