In the US those are "RV Parks". They're pretty good if you you're traveling with kids and want to give them the opportunity to meet other kids and play with whatever amenities the park has. Camping in a state or national park is better if you want to more space and a more natural experience. Areas in some nattional forests are available to camp in for free as long as you don't stay in the same place for more than a week and clean up after yourself.
In the US those are "RV Parks". They're pretty good if you you're traveling with kids and want to give them the opportunity to meet other kids and play with whatever amenities the park has. Camping in a state or national park is better if you want to more space and a more natural experience. Areas in some nattional forests are available to camp in for free as long as you don't stay in the same place for more than a week and clean up after yourself.