No experience with them but have a look at Carolina Boots. They make some big boots. Carolina Footwear | Welcome to the Official Home of Carolina Shoe - CarolinaShoe.com Here's a source too. https://www.shoes.com/size-17-extra-wide-mens-work-boots.htm
I've been buying Carolinas for the last several years and they hold up pretty good considering once I buy them I only take them off for bed. The wife makes me. Been getting them at super shoes and they run some pretty good discounts.
Here's another source of big/wide boots. Good luck. I know what it's like when you have a boot that you like and they change it or stop making it all together. Composite Toe Boots for Men of Sizes Ranging from 7-17 to EEEEEE - 6E | XLFeet