I build my own. Better and stronger than just about anybody out there. Cross braced, expanded metal up top, every piece welded, full hooks off each main support.
Expanded metal can be smaller holes than picture I've attached. And the escape door adds a lot of work but nice for emergency egress.
i also attached them to window well interior with quick disconnects which adds security from intrusion but allows quick escape if necessary.
My kids walk on them every day. I walk on them every week. Only thing that goes down is small rocks and sand.
I used to sell a lot but have run out of time lately, will try to pick it back up again. Not cheap as they are material and labor intensive to build but should last a lifetime. I haven't powder coated them to save on cost, but a quality primer and paint and a touchup once a year should do just fine.
Attachment 71746