Noises like this are kind of like water leaks, it is difficult to find the origin sometimes. I had one similar only in the front of my MH and I found it by getting under while someone else walked above. It took a few times but if you have some help you might be able to locate the source. One person recreates the action causing the noise and the other looks for the actual source.
In my case it was a piece of sheet steel above the transmission between the frame that was flexing and causing the drum noise you describe. A muffled boooom.
Interesting enough I have the same noise as you right now. My MH is in storage and after a tough winter we put it away for a while but soon I will have to do the same thing in the back of our MH.
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03 Dolphin LX 6355, Workhorse W22, 8.1 vortec, 04 CR-V, Blue Ox, Brake Pro----Norm, Barb and
Doc(He's a PhD)
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