Sorry guys, but the only person who got this answer right was Cyclone IMO. Nobody else touched on WHY you shouldn't do it but him.
If there is no debris between the wear ring and impeller I would not be afraid to run my pump dry. Problem is, to make sure there is no debris you need to pull the bowl & impeller and rinse it out. To put the bowl back on properly the pump should not be in the boat, otherwise you're taking a small gamble "hoping" that you have the bowl registered properly on the suction housing.
If you've never pulled your bowl & impeller after traveling even a short distance, try it sometime. You will be amazed at what you find between your wear ring & impeller. Whenever launching Always drop the boat in the water deep enough to submerge the pump, pull it out to wash all the debris out, and then you can put it back in and take it off the trailer.