The first question is why? The main advantage of a gooseneck is to center the tongue weight on the rear axle. No offroad trailer would ever weigh enough to need to be supported on the axle.
A gooseneck is already a mild offroad hook up in the first place, more so than a 5th wheel hook up. A good goose hitch can articulate 30+ degrees.
That is why farm trailers and horse trailers use a gooseneck instead of a 5th. (that and loss of bed space)
I have pulled gooseneck horse trailers thru all kinds of crap on the farm in my youth with no issues.
I agree with FLFJ40, if your using a trailer heavy enough for a goose hitch then you really don't want to be in places that require more articulation than a gooseneck provides.
My 0.02