I've been on the loosing end of UPS disputes for a long time.
Unfortunately, factory-supplied shipping cartons do not meet the "standards" for UPS packaging. The rule of thumb for "correct" UPS packaging is that it needs to be able to survive a 2 foot drop. Which translates into double boxing pretty much everything.
A recent UPS event involved a hand-made cello I purchased from the artist out of state. I BEGGED them to "overpack" the piece. It came in with the neck broken off. A close look at the packing revealed there were pretty of opporunities for damage to occur.
Palleting goods is a good idea. It certainly adds enough bulk so that machines, not people, will be moving them around. And, another layer of protection.