GMC - E4500 - 2005 RSS 2005 GMC E4500 EQUIPMENT ADAPTIVE/MOBILITY:WHEELCHAIR LIFT/RAMP 2005 GMC E4500 STEERING:HYDRAULIC POWER ASSIST SYSTEM 2005 GMC E4500 ELECTRICAL SYSTEM 2005 GMC E4500 EQUIPMENT 2005 GMC E4500 VISIBILITY:DEFROSTER/DEFOGGER SYSTEM 2005 GMC E4500 ENGINE AND ENGINE COOLING:ENGINE:DIESEL