Fellows - looking back on analyzing product transport survival strategies in trucks and trailers in our experience brings one important factor to mind:
how well is the vehicle/trailer your product rides in "sprung". Is it loaded heavily enough to be riding "in" the springs - or "on" the springs. SUV's can be fine if they are not equipped with heavy towing springs but then operatin much less havily loaded.
We have instrumented products comparable to the size and weight of Kapex on UG and tested over the road LTL transport on a pretty decent highway route. The nearly 10g (!) acceleration recorded explained why we had product assemblies vibrate loose.
If you must use a trailer, I recommend making sure the springs are deflected when loaded and shock absorbers, if installed, are in good condition. Use ballast, like any good Loadmaster to get the result you need.
Strapping the shipment tight to prevent secondary collisions between the product load and the vehicle are essential. E-track in a transport vehicle are easy and inexpensive to install and provide convenient ways to quickly secure cargo.
All this is much more important than foam padding.
Hans