Shipping in Excess of 30kg?

I have been trying Google, but I can't seem to get a clear answer.

So I'm hoping to see if anyone here can help.

I am trying to ship work equipment from Fussa to Okinawa, but Yamato Shipping has a 30kg weight limit.

I can break my equipment down to smaller sizes if necessary, but I was hoping that someone would have an answer.

Is there a Yamato Heavy Shipping option (approximately 60kg-70kg) per item?

Or another company?

I have had Yamato ship this before without making smaller parcels, but it was from Okinawa only.

I do not know why they allowed me to ship my heavy equipment from Okinawa, but never anywhere else.

It's five large Pelican cases.