Winnebego Le Sharo veggie oil tank inlet and outlet question


I have a Winnebego Le Sharo and am in the process of converting it to run n used veggie oil. I am following the conversion as much as possible. I am having a oil tank made to fit in the back. The only question I have is about inlet and outlet sizes and if there are standards. What would you suggest? I plan on mounting two prefilter boxes to the outside to go in (which means I'll need two inlet holes I believe) then from there into a fuel filter. What filter has worked well for large conversions and what inlet size should I try to match up? I am thinking this depends on my filter but I want to check.

Thanks in advance!

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