I don't lock them up and don't worry about it - life is too short. Although maybe if I had a Hensley I would! I just have a simple Eaz-lift system. When I'm camped I have a foot-long 2x4 that I stand on it's side under the tongue, and another small 1x4 and I simply hang the corner end of the bars over the 2x4, with the greasy part resting on the small board. The drop bar ass'y comes out of the receiver and goes under the front of the trailer. At home it all goes under the back end of the trailer, pretty much out of sight. I have left my trailer for a week at a time in RV parks - never a problem.
2012 Flying Cloud 23-D
1971 Safari 23 (sold)