This one is from SLC Quad Customs and runs about $400 bare.
I can't remember the exact amount but Lance took their ladder swingarm, on two stands and used a jack and tried to crush it. He said it flexed 1/4 of an inch and the jack gave out before it did anything to the swingarm.
So to answer your question: Yes I think it would hold up to MX.
![;) ;)](https://raptorsource.com/forum/Smileys/custom/wink.gif)
They are strong, yet light. Weighs 13 lbs. You should get the heavy duty ladder though, its thicker wall tubing.