We used a wonder wash for a year along with a "spin dryer", both from the Laundry Alternative. They worked very well and the spinner didn't take too much power (used on sunny days).
The next year we were building a tiny house on wheels and upgraded to the side by side combo similar to the one Bob linked. It was nice to not have to crank the handle to wash. You can add water to the tub without using the tube that connects to a faucet.
Space is the biggest issue, in my oppinion, with these. They take up a lot of space for an item used once a week. Water use is another issue. The wonder wash can be used with less water and with some creativity the rinse water can be recycled into the next loads wash water.
In the end we decided that since we would go shopping once a week anyways, we would wash clothes at the laundromat and hang on the line back at camp upon returning. If you are buying water plus going to town anyway, it seems be a wash (pun intended).
The folks i admire are the ones that can do all their laundry in a bucket with a plunger. That's amazing. I got the "no f'n way" look when i mentioned that to my wife.
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