Sounds frustrating! Just wondering if rotopax would work for your application? I've had a couple 4 gallon rotopax gas tanks for about 5 years and they've held up well (once you get used to the annoying "non-spill spout".)
I can also attest to their quality and that they don't leak-even in the sun, on the roof rack-I've never had an issue.
I can also attest to their quality and that they don't leak-even in the sun, on the roof rack-I've never had an issue.