Can I wash 2 comforters together in a commercial frontloader?
Yes you can, as long as you use the largest machine available with room to spare in the drum.
"comforters" come in MANY different sizes, materials, stuffings, etc. It all depends. If there's room in there for them to slosh around when wet, you'll be fine. If they're too big or have stuffing that doesn't wet down so they can't slosh around, it won't work. Use your head.