Joe,
We have no issues installing a leveling kit on a 2013 Ram 1500 4x4 with a 5.7l. We offer the Bilstein 5100 Series Ride Height Adjustable Shock Absorber BIL24-18767 http://jo.my/2013ram15004x4. This will allow you to run a 33x12.50 or 305x75 tire.