You want between 1/4" and 1/2" of preload on the SumoSprings Trailer Helper Springs item # TSS-106-40. If not you'll get a harsher ride quality because the springs will always been engaged or you'll get nothing out of them because the suspension will have to travel too far. Three 1/2" spacers for each side are included with this kit to make sure the springs are mounted correctly.
This process is outlined in the installation instructions I have attached below. Steps 2 and 3 will walk you... view full answer...
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