If your on the highways as much as I am. Sooner or later you will see spare tires mounted on these bumpers or bikes bouncing like crazy. I think if you pull it out and use it maybe shin it so it cannot wiggle and that may help with some of the bounce. That bar your talking about. I bolted mine into place upright and welded a same size tube across the top 12" long. I than drilled 2 holes near the ends and mounted 2 lights and wired them into the battery with a switch and fuse. Now I have 2 55 watt rotating lights on the rear of the trailer. I could still carry bikes or anything the bumper will hold but, really likely never will. Cost about 40 bucks and 3-4 hours of work. The lights work great.
2013 24RKSWE (27ft TT) Cougar 1/2 ton series
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed 3.55 rear end lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.