CKeith:
Back home in Texas, I've seen lots of lifted trucks pulling modified goosenecks. The neck of the trailer is taller and allows the trailer to ride level. The problem is you need the trailer to be level and the weight equal on the axles. Without height adjustment of the gooseneck, you could be pulling a trailer that has more weight on the rear wheels and less on the front.
If you pull lots and haul real heavy loads, you might not want to raise your truck.
Hope this helps,
Wiredawg