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Ours has the CRE300 which will give 3" added travel while the CRE4000 looks to be a heavier duty and with 4" added suspension travel and would expect it t be used for a heavier trailer. Ours bottomed out with the CRE3000 - hard. It took an extra spring leaf and a 1" spacer and four 6x12 16ga metal patch plates to fix that nasty scuff. I can only guess how bad that scuff would have been with another inch of travel. Oh and that Amazon CRE4000 kit is not complete without the MorRYDE X-factor cross member to reiforce and steady the much longer lever arm hanger assembly
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