This trolley will not be light , I've been down that road many times with old mate in China .
He insist that the trolley must be very stable and safe at any height or angle or position .
So it has to be able lift 150kg in front of the trolley or on top of the trolley .
I have gone back to him with having the handle folding ,and to have rubber wheels , just waiting for his response .

Cheers Tony