I have a '91 Multivan with a secondary battery kit under the driver's side
seat. I want to mount an inverter behind the battery compartment (i.e.,
behind the driver's side jump seat). Due to the geometry of the inverter,
two of the mounting bolts can be installed inside the battery compartment,
but the other two need to be mounted below the depth of the battery
compartment. I assume that this would require the bolts to protrude into the
wheel well. Is this a crazy thing to do? I was thinking that caulking would
be a necessity, but how many other considerations are there? Stainless nuts,
bolts & washers? Should I spray the area in undercoating after installation?
I have a great love for this van and am hesitant doing things that might
introduce corrosion. If you need pictures I can send you an idea of my
proposed installation location.

Thanks in advance for any ideas,

DW