Contact the manufacturer and see if the trailer can take the stress of a goosneck conversion. Most can't, and thus the warranty is voided.
BTW.... why post the same question in two places?
Rich & Kim, Oreo too
<font color=blue>F250 Supercab</font>, <font color=#33ccff>Prowler 5ver,</font>,</font><font color=red> Colorado Springs CO</font>