Your Rockwood has an ultralight frame and bumper.
Putting a bouncing and flexing bike rack on the bumper, is just asking for trouble,.
Like watching your bikes, rack and bumper bounce down the road, in your rear view mirror.
Only by having a receiver welded and braced to the frame and bumper, is it safe.
But this mod will void the frame warranty, if it's a new trailer.
Should be a sticker on the bumper or in the manual, stating this
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC