Lots of good ideas. Thanks. I have these stromberg stabilizers under the large slideout on the left rear side, but they sort of "fight" with the on-board stabilizers at the two rear corners -- crank one too tight and it takes the load off the others. I know you don't want to push up very much on a slide, and the concern is that someone might lower that side of the trailer with them in place and damage things. The argument in favor of supporting slides has to do with longer term occupancy and slides not being designed for that.
I wonder if those strombergs could work against the frame near the axles.
stromberg slide out stabilizersI have the Walmart version of the BAL X chocks on one side of the trailer, but would be willing to invest in a pair of the balx if you all really think the movement is the wheels moving forward and back due to low-tech chocks. Everyone seems to agree the king pin thing isn't worth it.