I think you've just proved the previous poster's point here: child seats alone most certainly present "complications". They have to be fitted precisely to your

I think you've just proved the previous poster's point here: child seats alone most certainly present "complications". They have to be fitted precisely to your child, they're a pain in the ass to install, and they have to be installed carefully, or they're worse than useless in an accident. For a typical parent use case like taking your kid to daycare and back, installing and fitting a seat twice a day in any sort of rental car is a complete non-starter.