My shackles and bushings were shot after 12K kms.
The only heavy duty replacement kit I could get had double thick shackles and extra long grease bolts that would fit, and bronze bushings.
Didn't replace the equalizer.
There's a long discussion of this topic in the travel trailer section as a sticky at the top.
So far, the HD shackles have held up 2x as long as the originals.
2014 ORV Timber Ridge 240RKS,8500#,1250# tongue,44K miles
690W Rooftop + 340W Portable Solar,4 GC2s,215Ah@24V
2016 Ram 2500 4x4 RgCab CTD,2507# payload,10.8 mpgUS tow