Nation wide Quality Caring Delivery for Audio Gear

I can recommend https://artystransit.ca/en if you're still interested. I shipped a lot of audio gear through them and they take special care of their packages.

Use a good art handling shipper. Can deal with large items, build custom crates, weight is no issue, etc.  Not cheap, but completely reliable.  In NY / NJ / CT, Lockson is excellent (and they do relatively frequent runs up through New England)

In Australia Pack and Send are really good. Expensive, but they are privately owned franchises that rely on their reputation for business and will cater to your specific needs. I have seen them do some amazingly creative things.