I find the 2551 to have an improved ride, with alignment, safe-t-break and bilsteins. It drives more like a panel truck, and the total cost for these three services is about $1,100.The alignment shop put our tires at 85 lbs, need to check that out based on other comments.ge.montana2551S 2010
More air in the tires will improve handling by reducing tire sidewall sloshing. It also improves fuel economy a bit. But you get a harsher ride, uneven threadwear, and lesser grip on the road.