Listen carefully. I'm about to divulge my best, most-useful, most-fabulous gardening secret. Wait for it....wait for it....
Get rid of your wheelbarrow.
Wheelbarrows are medieval, cumbersome, unwieldy, often heavy, monstrosities that should be banned from gardening circles and left to muscular, sweaty construction crews. Literally, although there is some evidence that the Greeks and Romans may have used something similar, the best evidence is that the wheelbarrow became popular during the dark Middle Ages of Western culture. As far as I am concerned it should have been left there in the Middle Ages.
I don't own a wheelbarrow anymore. I've had two in the past twenty years; a typical steel-bodied, one-wheel contraption, and a two-wheeled plastic cart. Both suffered from the same problems in my eyes; limited payload sizes, a strong tendency to tip over on uneven surfaces and with large loads, tiresome to drag back up the Flint Hills after emptying, and finally, they just took up too much storage space. I threw the last one out when it fell off its designated wall hanger and banged into my shin.