That is a portion of the TV antenna system. There should be a round plastic piece used to turn the antenna and in the center of the round piece there should be a crank handle used to raise up the antenna.

*UPDATED*
I was reading a new comment and re-read what was already here and realize I made a mistake with my own comment below:
"Oh! Thanks Gene. The antenna was attached when I purchase and I guess those other part were removed as well for some reason."

I should have said, "The antenna was NOT attached. It may also be why I did not see any part on floor that may have fallen as mainah had suggested. I wish it had but when I did purchased, I was misinformed about a lot of thing in regards to the camper. Well, honestly, lied. I do think they previous owner where aware of teh quality in the bones of Sunline camper or there may be more going on with it than I am aware. It was late in the season when I got it and I also do (and still do not) have the right vehicle to tow so it was not used and I could not buy a battery to see if any of the appliance actually work either. I am also not sure if everything is connect where the water flow as well. It is beginning to warm up so we will see.

They get loose and fall off it maybe some where in the camper.