Every time my van makes a right turn over an uneven surface I get this thud/knock from the front end. Anyone experience this issue? I had a garage look at it and they couldn't find anything.

Could it be struts?

Could be lower control arm bushings, sway bar itself or end link or could be strut bearings.

Mine is doing this too - I looked underneath and found that the sway bar was broken.

Ball Joints? Just replaced both lower control arms, more $, less hassle.
At 240,000 miles the van is nothing but clunks and rattles, but I haven't made a car payment since 2001.
Good luck