just to let you know why so many advise against this on an ultralight trailer, it's because ultralights don't have the same beefy frame construction as 5th wheels, motorhomes and non-ultralight trailers.
and since travel trailers don't have shocks, the rear of a trailer will constantly be bouncing. just ask anyone who's ridden in a TT, while it's being towed.
therefore, all this bouncing will affect anything on the rear of the trailer, especially things that are held out and away, such as a bike rack or platform.
the physics involved will put stresses on the welds and metal of the frame and bumper, causing possible failure, due to its lightweight construction.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC