1st, Welcome to the forum
2nd, your issues with a goose neck and a RV fifth wheel are similar, yet very different, the main problem with the shorter bed and your RV5r is the width of the trailer when turning tight and 90 degree when parking, thus the need for the slider, with you gooseneck trailer, the problem is similar, but in most cases the horse trailer is much narrower, therefore the issue may not be as significant.
What to look for, measure the width of the gooseneck, divide by 2 and that should be your minimum distance required from the back of your cab to the pin on the gooseneck, that will give you a good idea of your requirements
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