@HORA
For no one specific reason but rather a whole load. I rented houses for about 8 years and was finding the expensive quite upsetting to occupy someone elses property. As a single man I found that I was never in a position to buy. Van living does away with an awful lot of the regular expenses.
I also prefer to own, occupy and consume only what I need. Before I bought my first van, when I gave up my last house, I sold or gave away pretty much everything I owned except for my car, some clothes and camping gear and a few books. I worked in a city during the day and headed out into surrounding countryside in the evening, setting up a tent as it got dark. Then packing it back into the car the next morning and heading back into the city. In the years since I have swapped to a van instead of a tent for more security and to save all the unpacking and repacking!
As for a reduced quality of life I can see that my lifestyle wouldn’t suit most people but I much prefer it. I have hot and cold running water, a shower, flushing toilet, regular bed, gas central heating, electric lighting, a kitchen, a place to stow my bike inside and a jet wash to keep it nice and shiny! It is fully insulated and the heating keeps it toasty.
The noise issue would be a question of expectation versus tolerance?