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The noise happens when the TM (not the TV) goes over the speed bump.The noise is very hard to describe but it does not sound like metal to metal contact,more like the body slamming down against the suspension bumpstops.
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OK, that description certainly changes the list of possibilities. I'm now thinking that there is some heavy object in the TM that gets tossed in the air when the TM wheels go over the bump, and then comes down with a thump.
The most likely location is toward the rear of the TM, since it is the rear that gets the most action on a bump. What do you have in the rear storage compartment? A tool box, or the dolly wheel, might make that sound. Unload the compartment, and see if the thump goes away.
Inside the TM, it is possible, I suppose, that the wardrobe rises off the floor an inch, then thumps back down. Put a pillow under it, and try again. Or the folded-down wall of the bathroom - find some way to pad that.
The battery might make that sound if it were inside. But unlike my 2720SL, your battery is on the tongue, right?
Stove grate might rise and fall, but I would expect that to sound more metallic.
Do you have your rock collection in a box under the bed? Or perhaps Jimmy Hoffa?
Anyway, you get the idea. Things at the back of the TM do get tossed around on speed bumps. Think about what could move, and experiment with it. I sincerely doubt that it your hitch or suspension.
Bill