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My question is why you're wanting a 9K axle on a trailer that it sounds like will only weigh in at around 2-3K loaded (based on your 75% comment.) A higher rated axle will be heavier, more expensive, and require more expensive tires and likely have brakes involved, which would be unnecessary for a 2-3K load.
I will also note: I have a 6K bumper pull camper, and I would never have another bumper pull that heavy. Anything that you lose in efficiency because of the extra weight in a goose neck is made up for in being easier on the pickup: All the load is on the rear side of my springs, and it causes a LOT of flex to the pickup that wouldn't be there if the load was centered on the axle as with a 5th wheel or goose neck. Ideally 10% of your trailers weight will be tongue weight, and generally speaking most bumper hitches (whether actually on the bumper, or a receiver type) are specked to a 200 lb tongue weight. I can say from experience that they will handle more than that, but it's not great to have so much disproportional loading on your rear springs.
Of course I pull this trailer with an F150, so it truly is too much for that pickups hitch rating, but if you figure for a 600 lb tongue load in the center of the axle, I would be well within it's axle and spring load rating, though still over on the GVWR of ~6500.
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