i have a scudo fitted with a 500 ltr flat tank , i bought some angle iron and cut to size , and painted with hammerite,
i also used some long 12mm eye bolts from screw fix,
lay ange iron across van floor , 1 at front, and 1 at the back of tank,
i then drilled through angle iron through floor and straight through chassis rails
fitted eye bolts with spreader plates on other side , then used ratchet straps,
my tank is quite secure , and has not moved at all
daz