For anyone interested, I'm posting pics of the rear diff breather modification that I did a few years ago. My TuRD is a 2017.

I do an occasional stream crossing, and the factory spring-loaded mushroom isn't that far off the ground. You can see it in the first image. And if you look close, you can see signs where it's relieved itself

Pics aren't great, but you should be able to see what I did. Remove mushroom, install factory Toyota union, run fuel line behind taillight with filter, and gutted mushroom on end.

If anyone has done something different, I'd love to see some pics.

I did this kit on my trail rig: https://www.lowrangeoffroad.com/differential-breather-kit.html

Not sure if it is better, but the install is stupid easy.

That looks to me like it would tear off in the wind or water. Is it more sturdy than it looks in the pic?

I was wondering about gravel.

Yeah, I wasn't sure about durability, but it has been drug through a lot of swamps, submerged overnight in one, and it has been a champ. On the front diff, I re-routed with fuel line and put the accordion thing at the end, so everything stays sealed.

Never seen at expandable breather before. Thanks for sharing, cwh2.

4th, I would be totally happy with your setup. Like the idea of the inline filter, and that seems like a good spot for it.

Sometimes there isn't a good spot, or a good way to route a line to it. I like the expandable breather for those times...

That makes sense, cwh2.

Toyota put the front breathers on the firewall for the Tundra, and they are fine for my uses. However, the factory rear diff setup doesn't give the warm and fuzzy, when making those deep stream crossings. I'd imagine the factory rear breather might get submerged launching a boat as well.