"There is only one ubolt per side that the axle tube bolts to the spring pack with. There is only one bolt on each end of each spring. What more do you need? My spring hangers have three holes each, but they are for raising or lowering the trailer."
Talk about a Homer Simpson moment. DOH!
I guess donn has never heard of the rubber torsion axles.
Actually, I wrote a post about this very subject, and how the axles can slip and rotate on the mounting plates, causing the tires of the related axles to lift. If only one axle slips and causes its tire to lift, that puts more weight on the other axle and tire. Not a desirable situation.
I solved the problem by drilling up through the axle flange where the camper frame rests on it. Actually, mine already had holes there, so I used them as a guide and drilled through the camper frame, then put 1/2 bolts in. I jacked up the camper, loosened the original mounting bolts, tightened the new bolts, which snugged the axle mounts tight against the trailer frame, then retightened the original bolts.
Now take note that where I say 'camper frame', it is actually the carrier frame for the torsion axles, and that in turn is mounted to the bottom of the trailer frame.
It all sounds a bit confusing, but anyone with these axles will know what I am talking about after they look under their camper.