Do you have to rotate the tires on the schwinn meridian tricycle?

Depends on how the drive is hooked up to the rear wheels. Many trikes have only one powered rear wheel and the other simply rolling along. If that is the case with the Schwinn then swapping the tires around can certainly be a good idea. But if it actually has drive on both rears then given the price of bike tires, there isn't much to be gained by rotating them.