The weight limits (pulling and vertical load) should be on the hitch (and in the brochuer) if it is a factory installed item. Regardless of the capacity, when you load the rear of a 5th wheel you are unloading the weight on the pin box hitch.
So if you are planning to tow something with tongue weight or use a rack for firewood or a motorcycle or whatever, a little experimentation will tell you how much weight it can carry before it starts negatively affecting trailer handling, and that amount of weight is likely less than what the hitch can handle.
Also any weight on that hitch subtracts from your cargo carrying capacity. So if you have an 11,000lb trailer with 7,000lb axles and 3,000 lbs cargo carrying capacity, but you load 500lbs on the rear hitch, your net cargo capacity is now 2500. This may be irrelevent depending on what you carry but a quick trip to the scales will help you make this determination.
So the point of all this is that you need more info than just the specs on the hitch. Over the years I’ve watch my son experiment with various loads on his 5th wheel trailers and it has been an interesting learning experience. As an example, a 400lb motorcycle on the back of a 30’ 5th wheel trailer took too much weight off the trailers hitch and cause unpleasant handling characteristics.
Pic below is from the brochure here: https://primetimerv.com/files/brochures/2022/2022sanibelbrochure.pdf . Is this 1 1/4” “accessory hitch” the one in question? The brochure doesnt mention specs but these hitches are fine for a bike tack or a couple hundred pounds of extra stuff on a rack, but thats about all you’d want to load on it.
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