That rubber bumper either popped out of its hole or was an extra the factory dropped during installation, and you flushed it out of its hiding place. Take a peek around in the general vicinity of where it was on the ground for a possible spot on the camper.
If you're going to "regret it in the morning", sleep until noon.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley