Trailer springs and shackles

I'm reworking an old two-wheel trailer for at-home use moving brush, rocks, mulch, etc., behind a garden tractor on the property. I bought the trailer for $5 many years ago at a yard sale; it incredibly didn't have a single weld -- all bolts, screws, nails and wood!. Over the years the wood deteriorated so that my starting point this summer has been two frame rails to which are attached a beam axle and leaf springs from a 3/4-ton truck. My question: The rather creative original builder attached the springs to the frame with shackles at each end of the spring eyes. Could that arrangement create a problem if I were to ever wish to convert the trailer to short-distance road use? Might the shackles at each end allow the axle to sort of "wiggle" at road speeds? (Does that question even make sense?) It would be simple enough to shorten the front shackles and weld them into fixed position on the frame, but would it be necessary?

(FWIW, I have several other two- and four-wheel trailers ranging from yard carts to car haulers. I ask about my latest project more out of curiosity than necessity. This trailer probably will never leave the property.)
 
You folks have confirmed what I've been thinking -- shackles on rear, solid hangers on front spring eyes. That's the way I've always built trailers. I was just taken aback by the dual-shackle setup -- never saw anything like that before. It will be easy to fix. As I said, this trailer was unique to say the least. As my OP said, it was assembled without a single weld, just an amazing assortment of small to big bolts, lag screws, small screws, nuts and nails. In a wild and wacky way, it was sort of ingenious. I've used it for several years to haul brush and branches to the brush pile, but it was falling apart too much to last much longer. It has given me a chance to refresh my somewhat dormant welding skills -- stick, MIG, gas -- and to use some of my stock of angle and channel iron. All in all, a fun project. I just wish I had taken a "before" picture to verify its odd uniqueness.
 
Cheap boat trailers, those running 1000# boats area, used a sliding spring to save costs. The front of the spring was attached in the normal way but the rear main leaf was different on the trailing end. Rather than having a place for a bolt, it was extended a couple of inches and bent to the horizontal. This horizontal "lip" fit loosely into a U bracket welded to the frame which kept it from lateral movement but on spring compression it would allow for the spring rear to move to the rear and absorb the shock.....noisy and rough on your hull.
 

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