rear wheel bearings

[Gary Nafziger <naffy@netins.net>]

        I don't have a problem with them, but was just wondering about the
longevity of the TR-6 rear wheel bearings.  Also, how do they usually go
out?  Do they give plenty of warning such as noise for several hundred miles
or is it a fast thing that seizes up quickly and dramatically.  Any
experiences out there.  Mine are off now, is there anything I can do to
check them out?
                Thanks    Gary Nafziger,   Wellman, Iowa