I would say the 150 lbs. is more correct. Personally, I wouldn't put more than 100 lbs. on the plant caddy!
I’m not sure, I bought them 2yrs ago.
This one is pretty sturdy and strong whereas the other ones were not strong enough at the middle where it is supposed to carry the weight.
I have had mine for several years and it has not rusted or peeling paint. It rolls very easily and has not left marks on my patio. I would recommend this product!