I have been looking at Rohrmann's tank support for a while, and I thought I would draw this section to illustrate what the red things are (taped pieces of foam) and why the support pieces that are between the steel angles and the tank bottom vary in thickness. The tank does not have a flat bottom - it slopes. Hope this helps. Rohrmann will need to answer your other questions.
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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