Gst rate for labour contractor with transporter

hallo sir or madam

Plese clarify the situation one Dock contractor done unloading goods from ship and load in lawrie then sent to principal premises.

my question is Dock contractor liable for registration in GST if yes what is the rate? 

labour payments done by rcm? if yes avail itc for rcm payment.

Pls clarifty 

Thanx in advance Sir or Madam