I have run the costs for a roto mould down here in SAfrica, where it would be cheaper to make the mould and then run it and make tanks, than in America.
If youre interested, I have all the people researched who would make it a proper venture.
I decided against doing it, rather concentrating on other businesses. But to give you an idea, to tool the mould will cost about R80000, which works to be about $11500 odd.
Be true....to yourself