Thinking of installing Bilsteins and rear spacer, question, if installing rear spacer is it required to replace rear shocks? I was looking at a 4" lift initially, however, may go with Bilsteins 5100 up front, rear spacer 1" or 1.5", and bilsteins in the rear, think it will be around $900 installed as apposed to the lift for $2200, any thoughts, suggestions. The lift I was considering was Zone or Roughcountry, however I tow a camper often, so wanted to maintain some rake so not to be nose high towing, therefore prefer a lift with option to have replacement coils in the rear and keep some rake. anyone want to add opinions????