The good news is that the hubs are sealed and nearly bullet proof. If you want, you can replace the hubs, or buy an extra and carry it with you.
There are several sources. The UHaul
Truck and Trailer Parts on line store has them for about $56 with free shipping (their eBay store also has them, but for more $).
Or, you can buy front bearing hubs to fit a 93 to 2002 Camaro or Firebird on line or at an auto parts store.
A good mechanic can "feel" the bearings and tell you if they are worn. This is done with the tire lifted slightly and the wheel assembly is rocked to test for freeplay.
eBay has 'em, too: