Lenny, congrats on adding to your fab capabilities, you picked a good brand to avoid buyer's remorse :thumbsup:
I bought one of those same HF cheap carts for my little Tig/Stick Everlast (except I got my cart from Amazon so it's BETTER 'cause I PAID MORE

)
Seriously tho, it appears to be identical but with a different NAME on it. Seeing what you did to yours so the 30air would fit, kinda makes me nervous for you - those things are marginal to begin with, so I can't help thinking that yours may give you problems with excess flex around the front casters. Pretty sure I woulda found a way to beef up that lower shelf with some angle UNDER the shelf.
My situation may be a bit different than yours, in that my "shop" areas are more gravel/dirt than concrete at the moment, so I modded my "crap cart" with bigger solid rubber rear tires and bigger,
LOCKING front casters (I prefer to be the one who decides WHEN things can roll around)- I also threw away the chineseum bolts and assembled the cart with slightly bigger (likely STILL chineseum) ones
The bigger wheels/casters help noticeably with "rough terrain" - I also lengthened the rear axle (needed 5/8" diameter anyway), so went with allthread and a couple extra nuts - feels more stable with the slightly wider track -
View attachment 584830 View attachment 584831 View attachment 584832
I haven't measured yet, but expect that cart will go bye-bye when I get around to adding a tig cooler
Anyway, advise here is usually worth every penny you pay for it; I just hate to see ANYBODY have problems that could've been avoided, and I've messed with enough HF stuff to know that if something wasn't necessary it wouldn't have BEEN there... Steve