VEVOR Mechanics Stool, 136.1kg Capacity Rolling Mechanic Seat with 10.2cm Wheels, Three Slide-Out Tool Trays and Drawer, Heavy Duty Roller Creeper Seat for Home Garage DIY Automotive

The cushion stays secure in place. My son loves this mechanic stool.

Probably not. The wheels will most likely sink into soft or loose gden soil. If it is kept on a hard packed surface then it will be fine.

Yes. As long as the space has a floor. I really use mine a lot. My floors are laminate and this allows me to do the trim & paint without setting on the floor. Both of my hips have been worked on and so getting up & down is no longer an option. I also use it on my porch when Im working on projects.

my wife uses it for a gardening seat at times,of course it doesn't roll as well if on a hard surface,but she does fairly well on grass

yes it is