Looks like the engineers just don't want us to buy these trucks for towing fifth wheels!!!!!
I've towed the same 5er (in my sig), with an 05' Chevy 3500 CC/LB dually, with a 2010 Dodge 3500 CC/LB/ dually, with a 2012 Ram 3500 CC/LB dually and now with the 2013 (all 4X4's)..The 13' IS higher, and on top of that, if you got the GN/5er prep package and the picture frame adapter...the adapter sit's taller than regular rails you mount your 5er hitch onto. I'm "more level" now with this truck than I was with the last 3...I lowered my hitch one notch (Reese 20K Signature hitch), and VOILA!! again, my 5er sets more level on this truck than the last three.
I still see a lot of brand new trucks out there towing, so, height is not that big of a deal. we may not like it, we may have to do a little more to level the combo, but....Ford and Chevy trucks aren't dropping in height, heck, the 2014 F350 CC/LB 4X4 King Ranch is taller than my truck, (my buddy owns one and pulled in side by side, his seems to be taller)..yet, I still see brand new tall, 4X4 Chevy's/GM's, Fords and Ram's towing 5er's out there....not a big deal, a little research, some adjustments and one should be good to go.