This is the most help I can offer. It sounds from the description that you have the KIB system. This is a manual for the system.
http://www.dutchmenowners.org/forums/attachment.php?attachmentid=3330&d=1464375899Are these pads? or do they appear to be studs with nuts on them? What I linked to may not help you, dunno.
My Winnebago View has a system with square pads on it, that are bonded to the tank, if this, I'm not sure as I do not know who made that system. Will have to look in my manuals.
Charles
'03 Ram 2500 CTD, 5.9HO six speed, PacBrake Exh Brake, std cab, long bed, Leer top and 2008 Bigfoot 25B21RB.. previously (both gone) 2008 Thor/Dutchman Freedom Spirit 180 & 2007 Winnebago View 23H Motorhome.