Unreal Engine Truck Tutorial: Trailer System 

Well, I go everything connecting and text showing up like it's suppose to...just can't get the trailer to move even after making sure it's a vehicle class with proper wheels assigned.

The docking of the Trailer was optimized in Part 2: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--cDTxQhKhfc.htmlsi=L5Mh_aHX8z8xDjpN

That is possible, but not easy to setup "safely". It would only work on a Straight Street of course.

@@Seredias. would you be interested in marking a tutorial of this? I can’t say I’ve seen a video covering this on any channel thus far

You need to create the Interact Interface exactly like I showed 0:59. 7:19 just pull the Vector then choose "Equal". You will get the tolerance.

@@Seredias. Thanks man, for some reason "Equal" didn't find in UE5, but i was able to find same function by searching "=="

Is the Trailer drivable by his own?

Yes, keep the "Cast to Truck". To create another Truck, create a Child Class of the "Truck". Then just replace the Mesh etc. In this Way it will work automatically with every Truck you create. Same thing for the Trailer.

Nope, just a Wheeled Vehicle BP that I called Truck. To create a Truck follow this Tutorial: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Z_BgNXtHQww.htmlsi=BRYyuekZGvMn8Yc9

That's actually very easy, just set the Y Scale to -1

@@Seredias. Thank you very much👍

Same concept, just add another Physics Constraint to the end of the Trailer to connect another one.

@@Seredias. could you do a tutorial when you press start that the trailer is already conntected

@@simidev5058 I will see if I can include it in the Series.

You could just "Set Actor Transform" to clip the Trailer to the Truck.

@@Seredias. thanks for replying sir 🙏😊

@@Seredias. could you please make a video sir it would be great sir

@@3dmodelsindia I will try to included in the Series.

@@Seredias. thanks so much sir

Yes, cause it is the same concept like the Cars.

I think this should help: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--V1WoTHvSyk.html

@@Seredias. Hi ;) thanks for your reply ;). Unfortunately i think my problem is more complicated . I'll try to explain it the better way. So i have a truck( 8 Wheels) and a trailer(8 wheels), both are two different mesh with there bluePrint working fine .all wheels need to be with realistic physics and suspension, it 's important. I have followed several of your tutorial to prepare vehicle , importe them, prepare theme, and make the trailer connect to the truck. As far all is good , the truck drives well , the trailer connects well ,and the trailer wheel can rotate in the y axes . The only problem is that i need that the trailer wheels also can steer right and left in a realistic way. But as the pawn class in the game mode is for the truck ... the trailer wheels wont turn as they are frome the trailer pawn class . I know the trailer wheels can steer because I tested to drive only the trailer and it behave normally like a car steering right and left. Sorry for that long explanation. Maybe i could command both vehicle movement components at the same time .. but i have no idea on how to do that . Thank for your time , if you have any idea, i really feel stuck , maybe you could make a video tutorial about that subject ;) Have nice day

Ah now I know what you mean. So in this Case, I would cast to the Truck from Trailer to get the Steering Input. Another way would be to cast to the Trailer from the Truck to set the Steering for both.

@@Seredias. Thanks that's a good idea ;) it would be perfect As i'm not really good in blueprint yet , could yous show me how to do that . that would be really nice ;) , thanks again ;)

@@BalthasarTruffaut I think this should explain, what I mean: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nQMwSWTFawQ.html

Weightbalancing or a invisible collision box is the Solution.

@@Seredias. but wouldn’t the collision box drag on the ground if you dock it?

@@mahakrandomusername2672 Of course you need to switch the Collision after the docking.

@@Seredias. switch collisions?

@@mahakrandomusername2672 So basically you would put a box under the trailer to stabilize it. You can then set the collision of this box, for example with “Set Collision Profile Name” when you dock or undock the trailer. However, keep in mind that this can cause problems later. A better idea would be to make the trailer base heavier than the container to stabilize it.

You need at least the Physics Constraint 4:42 and the connection itself 8:21.

Good Idea, I will do a Tutorial about it.

@@Seredias. thank you

Sounds like the breaks are active. To release them, just set Throttle Input to 0.01 for the Trailer 8:45

@@Seredias. it is set to 0.01 it must be something else but thank you for your quick response. :)

Did you follow the Import Tutorial to import the Truck? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-TItjnI4A0io.html

@@Seredias. oh sorry, problem not on truck but in trailer wheels

@@Seredias. truck without trailer is ok

@@Seredias. seems like wheels are blocked

@@user-gi8ou6dq7k Did you import the Trailer like the Truck?

Its difficult to explain, how to limit the Stacks. I think I will make a Tutorial about that. By the Way, please write in English, I don't understand Portuguese :)

@@Seredias. Sorry, I had used the translator, but I ended up pasting the text in Portuguese :( ... anyway, a video explaining it would be great, thank you very much

I imported the Trailer like a Car, so in theory you could drive the Trailer alone at the end.

@@Seredias. Yes I did exactly the same but have 6 wheels not four

I follwe your 6 wheel truck which works well but then made the trailer as a wheeled vehicle .

@@thailoz944 If the Wheels are spinning around, the Wheel Setup of the Vehicle Movement is the Problem most of the Time. So the Bone name has to be match exactly.

@@Seredias. Do I need an anim Blueprint for the trailer I meen the wheels on the truck are spinning like a burnout and nothing moves forward

Since I do this beside my job, I develop and record new Tutorials as soon as possible. But this is just my hobby and my passion.

@@Seredias. ohh OK I won't rush you

Sure, this for example is free: www.unrealengine.com/marketplace/en-US/product/twinmotion-construction-vehicles