With their headquarters in JAX (Jacksonville, Florida), Landstar is a large company made up of owner/operators running wildly varying equipment.
Here are a few of their rigs I've caught.
A highly customized Freightliner Coronado.

A fantastic looking Peterbilt 389.

A great looking Kenworth T680.

A classy looking Peterbilt 379.

A fairly plain and somewhat tired looking Freightliner FLD.

And a Kenworth W900L.

Caught this backing into the small parking lot of National Tire &Battery in Greensboro NC