HELP! 2013 sierra thumping under the bed sound

Vortec5.3

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So I had the bed loaded down with heavy equipment. After I unloaded I started hearing/feeling the thumping sound coming from underneath in the rear. The truck only has 1800 miles and should NOT be doing this. I looked underneath and everything "looks" ok the spare tire seems secure. Any suggestions??? I heard someone mentioning a possible loose gas tank?? Don't think so.
Thanks for the input....:(
 


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