It's possible to have too much stuff, but you usually only become aware of the fact when it's too late and you have to move it all to a different house.
After three years in a house that was too small for our stuff (some of it had to be left outside in the rain), it was finally time to move to a bigger house. Except for the stuff that had been ruined by being out in the rain, of course. Luckily, there was a Bring Out Your Dead day a few weeks before the big move.
To save about a thousand dollars, we decided to move ourselves. We rented a truck from Thrifty because the name simply appealed to us somehow for reasons we can't explain. It was a 3-tonne truck which is the largest you can operate in Western Australia with only a normal driver's license. It took four trips over a 48 hour period. We returned the truck at 1 o'clock in the morning.
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By the end of it, my body felt like I had been hit by a truck. A big, blue truck with the word, "Thrifty" painted on the side. Four times.
Interestingly, we put 170 miles on the truck but used only 8 gallons of diesel. That makes it slightly better than 20 miles to the gallon.
This gave me an idea. I could load my tired old 1800-cc Toyota light truck into the back of this moving van and cart it around everywhere I went. I'd get better fuel economy that way. Plus it would save on wear and repairs. With nearly 450,000 kms on the clock (that's 280,000 miles for my metric-impaired readers), repairs are becoming more frequent. It would also save on speeding tickets.
How can you avoid getting saddled with too much stuff? I suggest moving house every few weeks.
Just to be on the safe side.