Yup....had the similar problem when we traded vehicles....went from a 1500 2wd Silverado to a 2500 4wd Ram. Much taller, but I can see why you'd think the heights would be similar, being you only had a change in year. I would have thought the same as you. We had to buy a new hitch that dropped about 10". Plus we only had 1 day to find it. Fortunately, we had a trailer supply store in a nearby town and $200 later, we were good to go.
"If I was any better, I'd be dead"
"The sun's always shining...otherwise it would be dark"
"God looks out for the stupid, so I keep Him pretty busy"
2005 Dodge 2500 Diesel in proper Purdue gold and black (the Coally Roller)
2013 Jayco Swift 264BH