I used to have a mod called "Offroad Draw Trailer" it was a 3 axle gooseneck for the t series but I accidentally deleted it and cant find it on any mod page. If anybody knows what I'm talking about and either has the mod, or knows the link that would be much appreciated. (i know about Trailerpack but those trailers are smaller and not as durable) If I find the mod I will make sure I upload it here and give credit to the author if I can find who that is.
I've got one called Truck8x8Drawtrailer that attaches to the Truck 8x8 Heavy utility truck by Jalkku, I'm not sure if it comes with the Truck 8x8 Heavy utility truck mod or if it's a standalone mod created for it, I just tested it and it's working.