Yes, it is possible to drill through the top of the plant dolly.
The height from the ground to the lip of the dolly is 4 1/8 inches.
The Plant Dolly is manufactured in the US.
No, none of the wheels lock.
The diameter of the wheels is 1-7/8 inch
Yes, it’s on their web site.
the item said 500 lbs
Not sure of exact number but it handles a lemon tree weighing about 75 pounds
There are no predrilled holes.