Ours are 1 and 1/2 inches in diameter. The uprights sit in a pvc collar/connector that is bolted onto a square piece of plywood - approximately 12x12. The holders for the cross piece are big clamps that are easy to remove and replace - the cross piece simply sits on the handle part.
Another possibility if you want to change up the white is to wrap duct tape around - there are tons of color options now. Who knew duct tape would be a fashion statement?
The paint would be prettier and glossier - probably last longer too!
Have fun! Your avatar is cuter than cute! Is that Buttercup? Adorable!
And...........welcome to the forum !!!