Have a 2011 Durango Citadel 5.7 AWD with about 150k miles on it. When going over bumps it keeps bouncing and the ride height is not as good as my In-laws 18 Durango. I decided to go with Bilstein front struts. I am going to go ahead and replace the springs too. I was looking at Moog springs. They offer Standard Duty and Heavy Duty Options. I was going to order the HD ones but figured I would check first. Anyone know the difference between standard and HD? Any other parts i should replace with the struts and springs?