OK, I am at my computer. There are grounds all over the place. The Winnebago wiring diagrams treat ground more like a concept than a physical thing, very annoying.
You know about the one behind the batteries on the frame, just follow the battery ground cable.
On mine, the converter is under the stove. If you follow the green wires with your eyes, you can see them attach to the frame. You can't reach them from here but you can see them. To actually get at them, you have to remove the outside panel which is a real pain.
There is a ground at the left rear on the frame.
You have found the one on the front left side by the HWH stuff.
Under the dash is another, just flip up the dash and look just to the front of the steering wheel. You will see a bunch of white wires with a start washer.
There are probably more that I haven't found yet.
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2001 Winnebago Adventurer, 35U, W-20 8.1
F+R Trac bars, F+R sway bars, SafTsteer, F Sumo Springs, 4 Koni FSDs
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