I am planning to sell my speakers. Before I put them on the market, I want make sure I can ship them anywhere in the continental US. The speakers weigh 140lbs and the dimension boxed are H70" x L20" x W25". I was told not to use UPS. My speakers would most likely get damage during shipping with UPS. I don't know much about Fed Ex or DHL. What would be the best (and safest) way to ship the speakers? Is there an independent shipping company that can ship heavy items without damaging them?