I have a 2009 silverado 1500 lt with the 5.3L flex fuel. I'm ab to roll over 70,000 miles and I've noticed my ride seems more bouncy ESP when hauling trailers which is pretty regularly. Could my shocks be worn out already? If so what shocks should I replace them with? Should I put heavy duty shocks since I'm hauling regularly and also put load leveling air bags? Or maybe just heavy duty shocks. I also thought about putting regular shocks that are close to my stock ones and putting air bags. I have an onboard air system so the air bags would only run about $230. Any help would be great! Thanks!