Do you know anyone local with a Nissan Patrol. Ask to borrow their wheels for a test drive. Have the alignment checked with soneone else's tyres or have your old ones refitted for the sake of the alignment
If the car drives straight with other tyres then you are looking for them to replace the tyres under warranty for defect.

Another option is ask them to a trip the tyres off and spin them on the rims to a different setting them rebalance and try again.