When checking out "shorter fifth wheels and bumper pulls" remember that most of them will be "ultra-light" or "half ton" type trailers. Many of them have "light weight frames" that simply won't stand up to the added weight of a second trailer. And, to add "insult to injury", there's a new technology frame under many of the "less than robust" light weight trailers. The BAL NXG frame is a "stamped steel frame held together with huk-bolts". Many of them are specifically designed to support the trailer box and not much more than that....
https://balrvproducts.com/product/nxg-frame/
So, if you're looking at "shorter fifth wheels and little bumper pulls", make darn sure you crawl under the trailer and see if it has an adequate box frame that can adapt to a hitch receiver or if it's a frame built to "bare minimums and can hardle support the trailer on top of it.....
As cars and trucks get lighter, the technology of making trailers they can pull has eliminated much (if not most) of the reserve capacity that used to be taken for granted.....