OK. So the OP's question is basically answered so let me point out a couple of interesting (to some) facts about the gooseneck setup.
1) Since the hitch point is within the wheelbase, the trailer tongue load is felt as a load increase at the rear AND front wheels. With a BP trailer, hitch load increases the rear tire loads but decreases the front tire loads unless a load equalizing hitch is used. LE hitch attachment points have to be sturdy because the bending moment necessary to level the trailer and the tow vehicle is VERY large. Body/frame structure is not always 'there' to hold this bending moment. Also, because the front and rear tires both get increased loads, tire properties (cornering stiffnesses) on the axle are less different. So, the GN tow vehicle looses less designed in understeer, has less of a change in the steering gain, has better high speed stability and faster response times than with a BP trailer. Ever see a tow vehicle with its front wheels almost off the ground ? Suspension geometry is also less affected, especially at the front (steered ) axle.
2) Since the hitch point is ahead of the rear axle, turning response at high speed is also much better with a GN because the tongue initially moves in the direction of the turn instead of away from the turn, as with a BP hitch. This is especially appreciated when stopping and turning at the same time because the jacknife forces are stabilizing instead of de-stabilizing. Not to say that a jacknife won't happen, but is much less likely. If the decel is so large that the rear tires loose their sidegrip, your're gonna loose it. The hitch ball height above the ground is also a significant factor in improving the high speed handling because the trailer roll axis is angled upward in the side view.
3) The backing up task is much more natural because the tow angle gain (tow vehicle centerline to tongue) vs. steer angle is lower and has a positive sign. You don't have to turn the tow vehicle very much in the 'wrong' direction' before the trailer starts its arc. The tendency to have a longer tongue also plays into this. The use of GN horse trailers proves this advantage. Less experienced horse people (females) generally get the hang of backing up a GN horse show deal with very little practice. Because of the down the road dynamics of the GN horse trailer, the ride and handling features are also very much appreciated BY THE HORSES !!
4) It should go without saying that being able to See the hitch to ball connection when hooking up is one to save a lot of cuss words for better use.
Just to mention, there have been cool designs for a so-called 'shadow trailer'. This uses the roof centerline as a hitch point. It's most notable feature is the ability to turn the tow vehicle around within the tongue radius. So, if your backing up skills are still not so great, then just push it backwards while facing the direction you want to go. Popular with the boat launch folks when trying to retrieve a boat from a ramp when the low trailer is hardly visible, there is a long line of folks waiting to retrieve their yachts, there's been heavy drinking on the water, everybody is sun burned, and Momma is itching to get out of her wet suit.
A company used to pay me big dollars to analyze this kind of stuff. Its paid off in a happy and comfortable retirement.
Be safe out there !
