Those go around your lift arms, one on either side, to prevent the roof from collapsing if the lift cable should break. Put one on the front of one side, and the other on the rear of the other side. My old 2001 pop-up had them.
Geoff & Jill
& Sierra, the little white monster
2013 Ford F-150 XTR SC Ecoboost
2015 Jayco Jay Flight 24FBS