Use Greyhound Bus. Wrap the bumper with bubble wrap & cardboard so it looks like a big letter "C" from Sesame street.

It'll cost $80 or so LA to Philly.

I ship all my bumpers that way.

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David Hendy
'97 Renntech E60RS
'97 GMC 2500 Sub' Diesel
'95 E300D
'88 300TE
'88 250TD
'84 L/Rover 109