Looking for commercial type products and checking the website for parts/manuals can go a long way. Doesn’t always guarantee that those parts will still be available in a decade or two, but it shows the company at least making an effort to support those products. You’re paying up front though, that commercial product can be 5-10x the cost of the equivalent consumer model. Heck, sometimes people still buy those consumer models because it’s a lot easier to justify a $100-$200 price tag every, even if you expect to replace it every few years than $1000+ up front.