Hi Wilson3,
As was said, no on the bumper. Sunline made them on purpose to tear off with much more than a spare tire back there.
I also caution a 3 bike set even if you have a welded on receiver. 3 bikes, the bike rack and the receiver add enough weight on the back of the camper to be a concern that needs to be worked through. The T1950 that starts out with only 11% dry tongue weight and where the added weight can possibly upset the towing stability by making the tongue weight too light.
I know hauling bikes is an issue pending what your TV is. Have you considered other options? What is your TV? We may be able to offer some other options.
Hope this helps
John