It seems heavy duty enough for loads that a BX can lift. I did ask the same question of Greg (who makes them) before I bought it. This was his reply...
"I have used this design to lift mostly hay and brush, but I did drop a big maple and had to move bolts around I would guess them at 1,000#"
I'm not in a position to weigh it now, but the UPS shipping weight was listed at 70 pounds.
If you do choose one for a BX I'd suggest asking Greg to make it slightly shorter (i.e. narrower), maybe 46", to match the straight section of your cutting edge. If you look at the pictures on the BX wiki site you'll see why. I think it will fit more snugly.