Mowed lawns with a push mower for cash, when I was a kid. Sometimes I used a "garden cart" to haul the mower, gas, etc. I am talking about the kind of cart that has only 2 large bicycle wheels/tires. Its designed like a chinese rickshaw, in that you use the leverage built into the design of the cart to haul a lot of weight easily. I think we bought a cart hardware kit from a magazine called "Organic Gardening". We supplied the wood and wheels. It was cheap and easy to make and lasted over 20 years. I found a pic online, see below. Note: A critical part of the design is that the handle should be at the base as in the pic. If you have not used one, you will be amazed how much you can push or pull and how easy you can do it.