I have a #10000 Quality lift by Challenger. Pops my Diesel PU right up and is stout enough but I never felt super confident in the small footprint of a two post lift especially when the weight is never perfectly balanced. The bay I put it in is only 15' wide and that allowed me to build in a solid anchor point at the top of the lift for a bar on each upright to add a little extra bracing. Here are a couple pics. Nothing special but even with near capacity loads all the way up the lift feels absolutely rock solid now. Ed.

I know this Pic is from a post on page #1, and this thread is 12 pages right now.
But I was reading, and there was some controversy about the guy adding the
gusset arms to brace the columns to the wall. You hear that a lot on this forum.
Sayers of nay.
I don't usually tell people my credentials, but in this case I will.
I am a mechanical engineer, and I think adding these brace arms
IS AN EXCELLENT IDEA !
No, I would not consider the lift to be able to lift more weight
(although maybe it could), but it is just added safety factor
when lifting an offset load, like asymmetric lifts almost always have.
The people who are afraid of seeing modifications like this
just DO NOT KNOW about forces and directions (vectors)
and rely on taking comfort in a litigious pathway to blame others
for a problem, like the manufacturer. Or to say, they prefer to take
the path of blame instead of taking responsibility to create a path
to prevention of a problem. They want to rely on laws to protect
them from the wrongs of the world, instead of being an active
participant in life, and protecting themselves by being proactive
with their intelligent decisions. Belief in the collective verses belief
in one's self. Follower verses leader. This message board is one giant
collective. Lots of followers come here to seek validation for their
passive participation in society. I am not that way. I am proactive
and make my decisions to guide the path of my life, and do not look
to point blame for the shortcomings that happen to me in life.
I view the forum to try and get a window of how the collective of men
out there in society think and act. Normal is a conglomeration of the
actions of the masses. And normal is being perpetuated as how
everyone should be and act. Sounds like a snake eating it's tail to me.
Just like if people misuse a word, it still will get added to the dictionary,
even though it should be dismissed as bad grammar. An echo chamber
of validation. The more I understand about the collective, the better
I can navigate the faulty logic that exists in the collective. Thank you.
So keep posting here and I will keep gathering data on you.
Have a nice day.
--Doozer