I needed to skip over this idea, because I still have no idea at the moment how realize this suggestion.

Your theory is completely right.

What you describe there is how our vehicles are put together via lua. We start with the main vehicle and then have all the parts spawned in. This makes it impossible to save any attached stuff to the vehicle parts because they will always spawn in again, after the main vehicle.

We wont add a fix for this issue because it would be to complex to code a good working duplicator function that covers everything necessary. Besides that, our Dupe and Save compatibility only relates to saving the skins, colors and bodygroup of an SW vehicle. Especially for multi parts vehicles like you listed.

My prebuilt vehicles are meant for people who can't build there own in gmod. Of course they still will try to enhance these vehicles with props and stuff, but you need to accept the limits like in this case.

I think that is not necessary.
You can build that very easily like this:

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3446571587
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3446571921
Very easy to build and works well. I have to deny your suggestion.

TLTR:
I must deny it. I can't do it because lack of knowledge how to and I planned other things for the addon.

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Long answer:
All SW addons that including the fuction to lift objects, will work in the future very different. Like the Forklift and the cranes.

They will work physical in the future. So no more hacks for the forklift in the code.
I call it a hack because we know that the forklift don't move things physically. They are parented to it, like moving a ghost object until you detach it.

1. Palletizer STool
Creating such a tool would create much trouble for the code how the forklift determine the pallets from non pallet objects. It makes also trouble how we must handle prop protections for servers. Who is able to use it? Which props should be blocked to prevent exploits to lead to a server crash? To much that I need to take care of beside the fact that I never made a single STool, so I don't even know how to start.

To the point that the pallets are small compared to the gmod ones I can only say: Nope.
They are almost the same size:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3445833673
They have the same length but my version is a bit thinner in the wide.

2. Prop Freezing
Freezing would make the prop unmovable, no chance that I add that.
Play with the weight of the pallet or the props, that was what we did on the server where we used it in RP. Works very well.

3. Pallet Jack
I don't have the knowledge to create it. I can not imagine how that should work. Moving the pallet jack while walking. I speak from the technical side of course, I don't know how to manage that.

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If I get my hands back on the forklift and cranes to update them to work physically they should work better in most cases. This will still not solve the problem you have by putting props on the pallet. Therefore I still recommend using a weight tool to adjust the weight of the loading. The nocollide tool will also help. I know that this isn't maybe the thing you want, but it is the only way at the moment.

Even if the physical update would be out and you are able to lift other objects, like cars and stuff, stacking things on top of others is always a bit unstable in gmod. But, at least, you could parent the objects to the pallet if the physical update would be out.

I also will try my best in the future to make the forklift more user friendly!

I like the idea and I'm willing to make the rails. But not now.
I guess I can work on them after our 2 current projects mentioned from the Wip log #23.

Nice idea but I have to deny it for a good reason.

When we start again to work on our train controller, it will have also a controller entity. Further called CE here. This will be made because we need to re-code the whole train functions for the train controller addon in the future.

In the end our trains will work like normal seats and run with our CE. That should also result in you being able to make any of your creations to a fully functioning train with the help of our CE.

But be aware that this is only the planning!
We can't promise anything at the moment, maybe things will be changed in the development. This is a major project, which is why it takes so long to prepare everything.

It's not that difficult as you think it is.
With my knowledge it should be easy to create this train with wagons, light and horn.
It would have the same features as all my trains.

The thing is that it will not be a self made train, more a ported version. It need to be animated and tweaked too, to work with our API.

I wanted often in the past to create that train. We must consider that this train will have no interior for the driver cabin. Some of the train cars (from HL:Alyx) have interior but still not the train. I will think about it.

Closed as done!

Fixed:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3436937725
See changes notes here:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/changelog/3436937725

I found the issue and have the fix ready, but it will break the saves/dupes.
There is nothing I can do to prevent this.

The problem was caused because I forgot something in the code what is now added.
This is 100% not backwards compatible and can't made compatible just to clarify.