If it is one of the square tube sewer hose carriers, I would advise against it. They are simply cheap sheet metal and really not even any good for carrying the sewer hose. To safely carry bikes you need a secure mounting point. Something attached to the frame like a trailer hitch.
If the bumpers are too flimsy for a bike where can a bike rack be mounted. Can the Mini Lite frame handle long trips on our poor road systems? Anybody have issues with broken or bent frames?