How do I get rid of the squeak in my parked Tag? Lubricate the leaf spring? Thanks.

Sounds like this is the perfect test for you to know if you have the (crank down) stabilizers set "just right." When the squeaking stops you have applied just enough oomph to the stabilizers.

You could try to lubricate the trailing arm suspension (no leaf springs in the 2021 model, I believe) inside the torque tubes. I'm not sure how that is done.

It would be good to rule out wheel bearing play/noise, also. Pull/push on the top and sides of tire and see if you get the noise/squeak or feel a clunking/thudding sensation. If so, it's likely time to work on the bearings.