Dear lmkaminski82,

Sometimes cohesionless/loose soil may help you to prevent over-stressed barred tee near pig trap. Keep in mind that, pipe always pushes adjacent soil. These type of soil needs special considerations and construction procedures. You should also check the allowable loads on insulating joint before UG, if any.
You can also let the pig trap move a little bit in pipe direction. For this, you should also model pig trap and other connected piping.