so this is pretty general but hopefully someone has thought along the same lines.....
What 2nd tanks are you all running, either just for more capacity or for a different fuel type (VO, WVO, BD, etc.) custom, aftermarket?
I was thinking about mounting a second 60 series tank under my 60 series tank in my 60 series

to increase capacity, offer the potential to use it as a VO tank, and I don't use that space for a spare tire. I may be able to get a second 60 tank and it looks like it could be sandwiched (with fabrication of course) and not hang too low... maybe a thin skid plate? Thoughts?