2003 Lexus LX470 Q&A

2003 Lexus LX470 Question: hydrolic sensors

When driving at 20 mph feels like i'm running over bumps in the road but it's rythmic (bum...bum...bum). Below or above 20 it's okay. The mechanic says it's the hydrolic sensors going bad? I think it could be unbalanced tires. Any suggestions? -
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