Garden Wagon Flat-Free Wheel Upgrades
I have mentioned before that I have three 4-wheeled carts that I use all the time. I love them.
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Google pic of my type of wagon as in the photo above...
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The only problem I have had is that the pneumatic tires will go flat, eventually, as the tires wear out. I have tried putting in new inner tubes but found that only lasts maybe another year of two before the inner tubes need to be replaced.

Well, shucks. It costs about $10 per inner tube per wheel if I do all the work myself to replace them. Our local shop charges about $20 labor fee, per tire, on top of the cost of the inner tube, to put it into the tire.
Well, this year I discovered that two of my four tires on that wagon were flat after our winter cold. I pumped them up with air, but they were flat again in a couple of hours.
I am done with the yearly, or every other year, inner tube replacments. This year I got 4 new
flat-free tires at Harbor Freight on sale for about $16.00 each (regular price $22.00 each). They just had the best price at the time I needed them. But Home Depot, Menards, etc... sell flat-free tires as well.
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In theory, I should never have to replace those flat-free tires in my lifetime. Additionally, all you have to do with these new flat-free tires is pull out the cotter pin on the axel, remove the old pneumatic tire, and pop the flat free tire back on. Hardly any work at all.
As my pneumatic tires have been going flat on my various wagons, I have just replaced them with these flat-free tires to be done with it. That is what I have been doing for the past 2-3 years. No regrets. Saves me money in a couple years of use and forever after that as they don't need to be repaired or replaced anymore.
Just thought I would mention the flat-free tires because I have that wagon in my garage right now filled with pallet wood, and I will be swapping out the pneumatic tires (2 are flat) later today or tomorrow. The flat-free tires will save you money (and future aggravation) as soon as you put them on.