I had the same problem with my full suspension conversion. It did last a couple of years though and that was after red trails and stony trails. I think it is important to make a link using plastic ties between the front top of the battery and the saddle rails then when the rack cracks it stops it from violent movement which might well short out the power cable from the battery. I was surprised to see a beam rack on a hard tail though!Simon did bring the weight forward as much as possible and it may still be possible to add the rear legs.