If the locomotive is disconnecting so often then I would say there is a lot of resistance in wagon wheels. I suggest to dissasemble that wheels and clean them. Also the sound from locomotive running itself is a bit strange...
In American market it would be very risky to release a set with alternate build but without instructions...
This is still unknown but we have amazing picture with 3 of them together so I guess it makes sense to expect instructions...
Every LEGO Space fan should buy 4 copies of this set! Why?
1. For keeping it in mint and sealed box
2. For the main spaceship
3. For smaller spaceship
4. For the smallest spaceship
Yes, there are 2 smaller alternative builds...
I am afraid that the stacker cant put his load on the ground
The good point is that you can easily ad lights to locomotive (behind blue modified 1x1 brick you can see blue 1x3 panel with space for it)
At first sight it looks like Friends set. I am a simple man, I prefer simple colors (red, blue, yellow, green). This is definitely something not my taste...
On the other hand, saying it is wrong set having just a single, blurry photo is a silly move. The real star of the show is that red stacker
I think that it is just a simple M motor that will lock rear axle differential. I suspect there is another strong clutch in drivetrain between axles. Or maybe even power from 2 L motor goes to drivetrain that is protected by another strong clutch so customers will not call to LEGO service with broken pieces after driving.
If 2 driving motors arent hard coupled then LEGO could use Control+ software together with gearbox to make central differential lock without physical differential. On low gear each motor power his own axle, and on high gear only one motor will drive just rear axle.
42099 Extreme Offroader had good idea for front axle suspension but it was designed badly (poor ground clearance).
Today I realized that Unimog 8110 was released 10 years ago. For collectors it would be better if Zetros was the same scale - 4x4 on Claas or Unimog tires. It will look better together. I still hope it will not be 6x6.
If You talk about Zetros then I am almost sure that 2 XL motors will be used for driving. So one L motor will be for steering and the last one (propably L) could be for transmission. I think it could have 3 gears:
1st- crawling,
2nd- slow driving,
3rd- winch.