Hi, I've got a '13 Expy XLT. Other than a few batteries, 1 front and rear brake job, 1 new set of tires and 90K miles it hasn't cost me anything. I'm wondering if it is time for shocks, it seems like the body is starting to roll a little bit. I do tow a tandem axle boat trailer in the summer, about 5,000 Lbs. Thinking about billsteins all around. Any comments? Thanks