Bending of the frame usually happens, in my experience, when we try to level the trailer using the stabilizers.
85-90% of the weight of the trailer is through the springs and into the tires. No bending on the road unless you hit some REALLY BIG bumps, to the point where you are lifted from your seats.
We learned the hard way that we have to level the trailer left-to right by putting bocks under the low side tires. Then front-to-back using the tongue jack. Once leveled, deploy the stabilizers just to keep the camper feeling solid when walking around inside.
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!