I use a dense foam pad on the bottom
Then compartmentalize/organize things to fit fairly tight
I use blankets and such on the top surfaces of the containers
That sandwich those somewhat between their upper surfaces
and the underside of my trailer's lid surface.
I don't want to clutter this thread up with pictures...
But if you look at my build thread...
^ Here's a link to my
original build location
(as the thread here might not be updated or reflect what I've done with that)
In my original thread... You will see what I've done to minimize that movement.
Granted nothing will be perfect...
But the little details will pay out some... if the time is taken.
Oh if you run ice chest(s) in your trailer like I do...
Use blocked ice... otherwise...
standard ice will grind yer food and polish yer beer cans.
LoL