I am shopping for a class B on a sprinter diesel chassis. I am looking at models from 2006-2007, right around the time that manufacturers changed over from the 2500 chassis with a 5 cylinder diesel to the 3500 chassis with a 6 cylinder diesel. Can someone give me advice in the differences between the different generations of sprinter chassis? In particular, how does ride, handling, acceleration and hill climbing compare? Any other major differences?