I've never seen the UPS store properly package a heavy item. The items I've received from them that did arrive safely was by luck only and lightweight (eg preamps). I've purchased 2 speaker systems that were packaged by the UPS store, both were damaged and both could have survived if they had been properly packaged (ie with appropriate HD Box, double box, and strong packing. The use single ply cardboard, bubble wrap,and peanuts.
I would package them myself.
I would package them myself.