So.... if this is actually happening?... I have brackish water......
Question: if a tiger nerite and a zebra nerite make sexy time.... what do the offspring look like?

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The offspring require a host of various conditions to survive to adulthood where they resemble snails.
You can google them, but I'm under the impression most Nerites are not captive bred because they have a larval type stage after hatching where they feed on microscopic algae as they freely float around. I could be wrong but that's how I remember it. Highly likely you'll get eggs, but I don't think I've ever heard of captive breeding with any real success. Sorry to be a bearer of disappointment.

At this point.... its 4 hours of the tiger 'backpacking' on the zebra.. that has got to be a heavy load!

Off topic, but in grade school we did an experiment to see how many times their bodyweight garden snails could pull. We placed weights on a plastic yogurt lid which was scotch tape to the snail shells.
They were surprisingly strong. I can't recall the number, but maybe 50 times their bodyweight? More? Muscle related physics get weird at smaller scales. Ants are a good example. I think they can lift hundred(s?) of times their bodyweight. I'd be happy to bench press 1.5 times my weight. Much less strong enough to lift small cars. (Hundreds of times my body weight)

Entirely off topic, but interesting post! Here are the top strongest animals according to one website:

1. Dung Beetle. A dung beetle is not only the world's strongest insect but also the strongest animal on the planet compared to body weight. They can pull 1,141 times their own body weight. This is the equivalent of an average person pulling six double-decker buses full of people. Now that’s strong!
2. Rhinoceros Beetle. Rhinoceros Beetles can lift something 850 times their own weight. ..To put this into perspective, if a human had the strength of the rhinoceros beetle, it would be able to lift a 65 ton object. If the mighty elephant had equal strength to the rhinoceros beetle it would be able to carry 850 elephants on its back.
3. Leafcutter ant. ... Tiny leafcutter ants can lift and carry in their jaws something 50 times their own body weight of about 500mg. That’s the same as a human lifting a truck with its teeth
4. Gorilla. ... A gorilla can lift something 2,000kg (as heavy as 30 humans), over 10 times their body weight
5. Eagle. ...An eagle is the strongest bird, able to lift something four times its own body weight during flight.

fun facts, though I find the Eagle one the most interesting considering the difficulty birds have with lifting much weight when they fly. A trout is one thing but that sounds very impressive.

Imagine if it wiggled?

Last year a small dog was grabbed by a bald eagle on a leash in front of my house (I live in the city proper- but in front of a lake). I was astonished!
I have a vintage CJ7 with a very impressive lift/engine swap/restoration. The suspension is soft to allow flex when rock climbing, etc. Driving down the highway on a windy day I need to do two things: 1) make sure all cargo is even from side to side 2) take extreme precision to ensure I dont catch a gust!

I can only imagine that is what a bird must go through... elements can easily dictate the success of carrying massive cargo.