Many years ago I replaced the handles in my old heavy steel wheel barrow by making them out of 1 1/2" sq tubing and welding solid round in the ends this made it heavy but it has worked well for me
the other day while walking the wooded area of the property I found another wheel barrow with 1 handle completely rotted off
It had a good solid tire so that should be worth something but the tub was still solid. Nothing wrong with having 2 barrows I thought.
So I scavenged some sq tubing from an old weight bench to make the handles out of I didn't bother to add any round to them because I find it unnecessary