Door latch

Why do all trailers/RVs use the same old standard type door latch/lock? I've had 3 trailers/5ver and they all have been a pain in the rear. They never close easily, you gotta slam them to make them latch and sometimes (depending on the angle of the trailer) you'd think the window would break from slamming them hard enough to close. I've adjusted the strikers, filed the strikers and lubed everything but nothing seems to make them close easily for very long. Why wouldn't the builders make a regular house type round door knob work rather than the finger pull latch? Come on, we're well into the 21st century, you'd think they would come up with something better than what they've been using in the last 50+ years.
Has anyone come up with anything better? My wife complains about it all weekend and there isn't anything I've done that helps.