1. extract def.scs of main ETS2 directory
(use SCS Game Archive Extractor[modding.scssoft.com])
2. locate ...... def\oversize_offer_data.sii
3. COPY file to c:\Users\YOUR_USER_NAME\Documents\Euro Truck Simulator 2\mod\SOME_NAME_HERE\def
4. rename the file oversize_offer_data.sii to oversize_offer_data.SOME_NAME_HERE.sii
Now you have c:\Users\YOUR_USER_NAME\Documents\Euro Truck Simulator 2\mod\SOME_NAME_HERE\def\oversize_offer_data.SOME_NAME_HERE.sii

5. Open the file oversize_offer_data.SOME_NAME_HERE.sii
inside you will see all Special Transport path made by SCS
now it have 2 methods you can do
a. to change all with setting you wish
b. to select closer to your cargo dimension and use only them

in general i go with B
in our case dimension of cargo is around 4 4.5 25
(it no need to be perfect correct :P)

### FROM DRESDEN EACRES TO WROCLAW EACRES
oversize_offer_data : spec_offer.ovesize_11 CAHNGE TO spec_offer.11wtb (it must be custom name) {
route : route_data.dres_wroc1
cargo : cargo.silo CAHNGE TO cargo.wtb
(cargo.wtb - it is take of cargo file locate in cargo folder)
low_time_limit : 120
high_time_limit : 740
cargo_dimension : (4.6, 4.6, 20.1) CAHNGE TO (4.5, 4.5, 25)
(you can keep it ... change it to see the different)
cutscenes_intro[]: cutscene.ovs_i_sil2
cutscenes_intro_night[]: cutscene.ovs_i_sil2n
}

or it must look like that
### FROM DRESDEN EACRES TO WROCLAW EACRES
oversize_offer_data : spec_offer.11wtb {
route : route_data.dres_wroc1
cargo : cargo.wtb
low_time_limit : 120
high_time_limit : 740
cargo_dimension : (4.5, 4.5, 25)

cutscenes_intro[]: cutscene.ovs_i_sil2
cutscenes_intro_night[]: cutscene.ovs_i_sil2n
}

cutscenes_intro are a bit pain in ass to can find matching your cargo
but you need to test different and see ... ofc you can just remove that 2 lines of file and they will not apply

now you do the same action for all other path you want to use like ST job
the other paths that are not edit by you must be delete

6. Now you Activate your little mod in the game mod manager
and KEEP IT ABOVE the base mod