The Hesper and Luther Little in Wiscasset, Maine.
http://forums.pelicanparts.com/uploa...1495402875.jpg

close, they keep positive pressure on the differentials to prevent water entering the axles

Seems plausible but why the limb to the (presumably) valve stem?

http://forums.pelicanparts.com/uploa...1495411071.jpg

Kinda random:

http://forums.pelicanparts.com/uploa...1495411112.jpg

https://www.autoevolution.com/news/lamborghini-urus-pickup-truck-is-a-modern-lm002-rendering-95277.html
https://s1.cdn.autoevolution.com/ima...ng-95277_1.jpg
https://s1.cdn.autoevolution.com/ima...endering_1.jpg

Aug 3, 2016
What If Tesla's Pickup Truck Went After The Ford F-150 Raptor?
https://4.bp.blogspot.com/-VGCFTyVBu...-110063_1a.jpg

1957 VW T1 Pickup Truck | Auto Restorationice
http://3.bp.blogspot.com/-hdQfbT3pKs...ckup-Truck.jpg
http://4.bp.blogspot.com/-AfmmiHPi8S...Single-cab.jpg

Remote tire inflators. Decrease pressure for soft sand, increase for traveling on hard surfaces.

Advance to the 26:00 mark.
<iframe width="560" height="315" src="https://www.youtube.com/embed/fd0b08Zhq3Q" frameborder="0" allowfullscreen></iframe>

Fascinating stuff – and thanks for that find it on the video. It seems like maybe you're both correct – it definitely raises and lowers the tire pressures, but the video also claims to "pressurize the axle."

Before I watched that part of the video, and once it was suggested that it was for tire pressure, I was thinking perhaps they could compensate for heavier loads (and where those loads were placed) by raising and lowering the pressure, but it appears to have raised and lowered them all simultaneously.

Psst. Twas a joke. I love them and would have one given $$"s and space.

Under ideal circumstances the axles are only a couple feet below the surface of the water where they wouldn't see that much pressure beyond normal. Any deeper and you're swimming to shore and water in the differential would be your last concern. Later models did indeed use the differential housing as part of the pressure pathway reducing much of the exposed plumbing and accomplishes both tasks.

Stopped in traffic yesterday on the 101 S in Santa Barbara. It could have been a whole lot worse...

http://forums.pelicanparts.com/uploa...1495499535.jpg

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http://forums.pelicanparts.com/uploa...1495499535.jpg

More "traffic"

http://forums.pelicanparts.com/uploa...1495499772.jpg

http://forums.pelicanparts.com/uploa...1495499772.jpg

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"...headin' to the surf on time."

http://forums.pelicanparts.com/uploa...1495499772.jpg

http://forums.pelicanparts.com/uploa...1495501090.jpg
http://forums.pelicanparts.com/uploa...1495501090.jpg

Random TRANSPORTATION pictures
 

https://youtu.be/Qd-qN4DHLHo

This always is sad to watch... use a Pinto not a P-Car


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That's one way to make a slant nose conversion!