alt Hacker NewsYep, there is like two brands that specialize in three across.
A lot of new parents haven't yet realized that a carseat is wider than the average adult. Meaning that cramped middle seat isn't getting a third seat without very careful consideration and the right vehicle.
The one we use is diono but there may be others, and apparently in the UK you can get 4 across - https://www.youtube.com/shorts/AEwtjK-U5X0 or https://www.multimac.com - not rated for the USA, but in the USA if you have 4 kids they just issue you an APC ;)