This is a post from 12/2013 re my gooseneck on a 5th wheel.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/27423458/gotomsg/27423845.cfm#27423845
Since then we visited the Cedar Creek factory in Indiana and was told they had NO problem with a gooseneck.
We purchased a 2014 Cedar Creek 38fls with a Mor-Ryde hitch with the reinforced goose neck adapter plate installed by the dealer Timber View RV in Frankfort, IL
We hauled it to Ellenton, FL where we are now and had no problems on the way down.