I have looked at posts that I can find about this and have not seen any reports about how this affected the handling of the trailer.
It seems that many have put them on so:
How did adding a pumper carrier affect the sway and handling of a Scamp 19 5th wheel?
Thanks
Arthur
I have the receiver hitch on the rear bumper of my scamp. The only weight I ever carry there is our bicycles, maybe 75-80 +/- pounds with the carrier. This does not seem to affect the handling of the trailer. I have on occasion pulled the trailer with full water tanks (I have two tanks under the rear seats) and even this weight does not affect the handling. I try to carry water as little as possible because it is easy to fill tanks when I get to my destination. I believe that sway is more of a problem in bumper pull trailers than in 5th wheels, although I still watch my load distribution. Perhaps other people with more towing experience than I have can confirm/refute this.
wls53