Sharon -
Can you be a bit more specific about when the popping sound happens? When you start, does it pop when you take your foot off the brake, or when you begin to move? Same for stopping.
Does it do it at low speed? If so, one of you might get in the driver's seat and start and stop the rig. The other would stand next to the TM, and try to figure out where the noise is coming from. Is it in the hitch? In the wheels? For that matter, is it in the tow vehicle?
Bill
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