EZ-990 Medium Duty Load Leveler EZ-990 Medium Duty Load Leveler; 990/1200 lbs. Capacity CHEVROLET GMC SIERRA 1500 SILVERADO 1500 BASE DENALI HIGH COUNTRY HYBRID LS LT LTZ SL SLE SLT SSV WT XFE 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 4.3L (262) Vortec 4.3L LU3 (262) Vortec 4.3L LU3 (4293cc) Vortec 4.3L LV3 (262) Vortec 4.8L GEN IV Flex L20 Vortec (294) 4.8L GEN IV LY2 Vortec (294) 5.3L Ecotec3 L83 (325) 5.3L GEN IV Flex LC9 Vortec (325) 5.3L GEN IV Flex LMG Vortec (325) 5.3L GEN IV LH6 Vortec (325) 5.3L GEN IV LY5 Vortec (325) 6.2L Ecotec3 L86 (376) 6.2L Flex L9H (376) 6L GEN III Electric/Flex LZ1 Vortec(364) 6L GEN III Electric/Gas LFA Vortec (364) 6L GEN IV L76 Vortec (364) ELECTRIC/FLEX ELECTRIC/GAS FLEX GAS with Adjustable Hellwig Hellwig EZ-990 Medium Duty Load Leveler - 987 987 Leaf Spring Helper