There are so many things to remember when setting up and taking down. It is so easy to miss something. Don't beat yourself up. A couple of years ago, I forgot to fold the steps in, went to pull out of the barn, destroyed the steps, messed up my barn door.
I will say that this is why I never let anyone use our trailer. It is way too easy for miss things like this.
2012 F150 FX4 Ecoboost, 2016 Surveyor 274BHS
2003 Yamaha FJR1300, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs