By chance I spoke with someone local who made up stuff that needed dipping.
They hated our local plant so much that they would load all their stuff onto a truck and drive it half way across the country to a plant that they considered did a decent job.
I got a landrover bulkhead done by my local plant. First time it went there it came back hissing. They had not even left it in the zinc long enough to boil off the acid.
It went back to them, still hissing, and they did it again, and it was fine second time around. So it was possible to do, just not without a "conversation".
I hate to see bulkheads galvanized ,, you can have the best repairs there are , invisible and just perfect , the bulkhead sitting true straight and level ,,,, then they dip it ,, if its not kicked round the yard by the forklift driver , as they wont get off the truck to load anything by hand , or ratchet strapped to a truck for delivery like a Quaver ,,, its left distorted by the heat and every weld stands out like a Greyhounds balls ,,,
but farmers want them done ,,,,, do I sound bitter , and nearly as twisted as the bulkheads end up
yep .