I have your set up for the most part. 16' Megacab 2500 with the 6.7L. I am using the B&W RVK3600 (set to the lowest setting) that fits in the factory pucks. I LOVE the hitch. I'm towing a Eagle HT 26.5BHS which is probably quite a bit lighter then yours.
My trailer had an extra hole of adjustment on the leaf spring shackles so I had the dealer adjust it to the highest setting, looks like it gives it an extra 1.5"-2" in height. I also ordered the trailer with the 16" wheels so that add's some height also. The axles on my trailer came from the factory already flipped.
Anyways, it sits a tiny bit nose high but its nothing to be worried about and I think it still looks good. It looks more pronounced then it actually is in the one picture in the parking lot. The picture at the gas station is much more accurate.
And on another note, i put the hitch together and installed in about 1hr. It was a very easy task.....