in all likelyhood you either have a bad wheel joint or both, depends on which side the hop is occuring on or you possibly have a bad axle. a broken tooth or worn axle can cause that hopping/clunking when turning. those are the two most likely culprits. a universal joint is on the drive shaft and wouldnt likely cause that though the wheel joints appear very similiar and someone could have meant those.
rule out the obvious like a chunk of missing tire tread or a stuck rock. basically look for anything obvious then crawl under and check between the ball joints behind the backing plate to the rotors. there is a plus sign shaped joint, it should not be frozen or wobbly. if either of these conditions exists, there is the problem.
next do fully locked turns at slow speed and see if there is a clicking/clunking on either side when moving forward, that would be an axle.
next, it could be in the differential. in the older style trucks where you had lock in and lock out hubs, locked in hubs would hop normally due to no disengagement when turning like a posi-style rear end has. that is why the locker was mentioned because it can seem like there is a problem but in reality its working normally, unless its stuck in locked mode.